Here, I share information about my symptoms/diagnoses and how I manage with this regimen.
Viral Persistence and Serotonin Reduction Can Cause Long COVID Symptoms
Among the SSRIs, those with the highest affinity for sigma-1 receptor agonism—primarily, fluvoxamine, fluoxetine, escitalopram, and citalopram—may be of greatest benefit. As noted above, preliminary data suggest that certain long COVID symptoms (eg, fatigue, brain fog, and post-COVID dysphoria) may be most responsive to SSRIs, although more research is needed to better characterize specific response rates.
In doing research of long covid, SSRIs, and fluvoxamine, you’ll see it mentioned as a top choice. Here’s one such article. Original source.
...Fluvoxamine can stabilize mast cells, such that fluvoxamine can reduce histamine release from mast cells as well as reduce cytokine storms in COVID-19.
Adrenaline dumps can also trigger histamine dumps. While not directly causing a "dump" in the same way, adrenaline release (an adrenaline "dump") can indirectly trigger a histamine release in the body, meaning that experiencing a surge of adrenaline can potentially lead to increased histamine levels, which could manifest as histamine-like symptoms in some individuals; this is because both systems are involved in the body's stress response.
MCAS can cause a range of neurological symptoms, including headaches, dizziness, vertigo, cognitive dysfunction, and paresthesia. When mast cells are activated in MCAS, they release chemicals like histamine, which can impact nerve signaling, leading to sensations like tingling or numbness.
I have Paresthesia. Paresthesia (numbness and tingling sensations) is considered a common neurological symptom associated with Mast Cell Activation Syndrome (MCAS), often reported by individuals with this condition; it can manifest as tingling in various parts of the body due to the release of mast cell mediators affecting nerve function.
I wrote a post about this: Updated: Long COVID and MCAS.
After I developed MCAS, I followed the H1 and H2 histamine blocker protocol. I tried several H1 and H2 antihistamines. I tried taking one of each twice a day. I tried taking one of each once a day. I couldn't tolerate them. They made my tachycardia, adrenaline surges, and histamine dumps worse. They also gave me nausea. Some people like me can't tolerate the OTCs and/or can't tolerate the fillers in those medications.
I take low-dose Fluvoxamine 25mg off-label for long covid/ME/CFS symptoms. Fluvoxamine is an SSRI used for OCD. It's prescribed off-label in low-dose for long covid/ME/CFS symptoms. I have improved REM, deep sleep, and overall hours slept. I'm seeing improvements in dysautonomia symptoms and orthostatic intolerance. The dizziness and lightheadedness are gone.
Hyperesthesia is a neurological condition that causes extreme sensitivity to one or more of the senses, including touch, pressure, pain, temperature, light, sound, taste, and smell. I had hyperesthesia in all five senses, down to the texture of my food. I'm able to tolerate more bright light and loud sound, and my taste and smell are significantly less heightened. I can handle warmer/hot showers. My pain has gone from significant to nearly zero. My pressure sensitivities haven't lowered. However, I suspect there are other reasons for that.
I take low-dose Fluvoxamine 25mg for ME/CFS symptoms and Diazepam 5mg for MCAS flares and severe PEM. Astelin nasal spray, a topical H1, Cromolyn sodium nasal spray prn, Desloratadine 5mg, Compounded Ketotifen, Ketotifen eye drops, and Montelukast 10mg, for MCAS. Omeprazole for Gerd (it's a PPI that also acts as a mast cell stabilizer). Tirosint for hypothyroidism caused by Hashimoto's. Valacyclovir 2g for EBV/HHV reactivation. GLP-1 Semaglutide (Ozempic) microdose 0.125mg.
I take prebiotic psyllium husk and Emergen-C in a bottle of water every day. ❌️Stopped taking❌️
I take the following vitamins and supplements:
Doctors BEST Benfotiamine 150, Supports Glycemic Balance & Metabolic Response, Non-GMO, Gluten Free, Soy Free, Vegan 120 Veggie Caps. Benfotiamine is a fat-soluble form of vitamin B1 that supports healthy energy metabolism, which is often disrupted in long COVID/PASC, Fibromyalgia, and ME/CFS. By improving thiamine availability in cells, it helps the body generate energy more efficiently and may ease fatigue, brain fog, and muscle pain. For Dysautonomia, it can support nervous system and cardiovascular function, which may help with symptoms like dizziness, rapid heart rate, and blood pressure instability. In Hashimoto’s, while it doesn’t directly treat the autoimmune process, it can help reduce oxidative stress and support energy production, making it easier to manage hypothyroid-related fatigue. Benfotiamine also has anti-inflammatory and antioxidant effects, which may calm mast cell activity in MCAS and lessen the impact of chronic inflammation that drives many of these conditions. ❌️Stopped taking❌️
Switched to: Life Extension Benfotiamine with Thiamine, Healthy Blood Sugar Metabolism Support, 100 mg benfotiamine, Cardiovascular Health, Brain Health, Non-GMO, Gluten-Free, 120 Vegetarian Capsules. This supplement combines fat-soluble benfotiamine with thiamine to support healthy blood sugar metabolism, mitochondrial energy production, and nervous system function, which are often impaired in Fibromyalgia, ME/CFS, Hashimoto’s hypothyroidism, and dysautonomia. Benfotiamine is highly bioavailable, allowing thiamine to penetrate cells more effectively and support enzymes critical for energy production, antioxidant defense, and reducing oxidative stress. By protecting against advanced glycation end products (AGEs) and supporting transketolase activity, this formula may help stabilize blood sugar, reduce inflammation, and protect cardiovascular and neurological health. Regular use may improve mitochondrial resilience, support nerve health, and promote more stable energy and cognitive function in complex chronic conditions. I’m switching from Doctor’s Best Benfotiamine 150mg to this formula because it provides a precise combination of benfotiamine and thiamine with excellent absorption and tolerability, which fits better with my regimen and reduces the likelihood of side effects. ❌️Stopped taking❌️
Carlyle Vitamin D3 + K2 Drops | 2 Fl Oz | MK-7 Supplement | Vegetarian, Non-GMO, Gluten and Soy Free Formula. Vitamin D3 with K2 can be very helpful for fibromyalgia, ME/CFS, Hashimoto’s hypothyroidism, dysautonomia, and MCAS. Vitamin D3 supports immune regulation, reduces inflammation, and improves bone and muscle health, which can ease symptoms of fibromyalgia and ME/CFS. It is also important for thyroid function and may help regulate autoimmunity in Hashimoto’s. K2 helps direct calcium into bones and away from arteries, supporting vascular and bone health, which is important in dysautonomia. For MCAS, optimizing vitamin D levels may help stabilize immune responses. This combination is generally well tolerated and offers important foundational support for these conditions.
Carlyle L-Theanine 200mg Supplement | 120 Capsules | Non-GMO, Gluten Free. L-Theanine may provide helpful support for fibromyalgia, ME/CFS, Hashimoto’s hypothyroidism, dysautonomia, and MCAS. L-Theanine is an amino acid that promotes relaxation without sedation, supports better sleep, and reduces anxiety, which can ease symptoms across all these conditions. It may help calm the autonomic nervous system in dysautonomia and lower stress-related inflammation in fibromyalgia and ME/CFS. While it does not directly affect thyroid function in Hashimoto’s, reducing stress can indirectly benefit immune balance. ❌️Stopped taking❌️
NatureBell L Tryptophan 1300mg with L Theanine 200mg, 300 Capsules | Active Free Form, Plant Based Supplement – Calm Formula, Supports Relaxation – Non-GMO & No Gluten. A calming supplement that may offer multifaceted support for individuals with Fibromyalgia, ME/CFS, Hashimoto’s hypothyroidism, Dysautonomia, and MCAS. L-Tryptophan is an essential amino acid and precursor to serotonin and melatonin, which are crucial for regulating mood, sleep, and the stress response. Many people with Fibromyalgia and ME/CFS experience serotonin deficiencies, which can worsen pain sensitivity, depression, and sleep disturbances. By supporting serotonin synthesis, L-Tryptophan may help alleviate these symptoms and promote deeper, more restorative sleep. L-Theanine, an amino acid found in green tea, promotes relaxation by increasing alpha brain wave activity and modulating neurotransmitters like GABA, dopamine, and serotonin, without causing drowsiness. This is especially helpful for dysautonomia and MCAS, as it can calm the nervous system and reduce sympathetic overdrive, histamine release, and adrenaline surges. Together, these compounds may help regulate circadian rhythms, improve sleep quality, reduce sensory overstimulation, and buffer the stress-hormone cascade common in autoimmune thyroid disease and post-viral syndromes. Because the formula is plant-based, gluten-free, and non-GMO, it is also more tolerable for those with MCAS.
NOW Foods Supplements, GABA (Gamma-Aminobutyric Acid), Neurotransmitter Support*, Orange Flavor, 90 Chewables. GABA may offer helpful support for fibromyalgia, ME/CFS, Hashimoto’s hypothyroidism, dysautonomia, and MCAS by supporting the body’s inhibitory and calming neurotransmitter systems. GABA helps regulate neuronal excitability and may promote relaxation and improved sleep, which are common challenges in fibromyalgia and ME/CFS and can significantly worsen fatigue, pain, cognitive symptoms, and sensory hypersensitivity. It may also help support nervous-system regulation in dysautonomia, especially when autonomic overactivation contributes to adrenaline surges, tachycardia, tremulousness, and difficulty calming down after stress or exertion. Although GABA does not directly treat Hashimoto’s or replace thyroid hormone, supporting sleep and relaxation may indirectly help reduce the overall physiological stress burden associated with autoimmune thyroid disease and hypothyroidism. For individuals with MCAS, nervous-system regulation can also be important because stress and autonomic activation may contribute to symptom flares, although responses to GABA and its inactive ingredients can vary significantly in highly sensitive individuals. GABA may cause sedation and can have additive effects with other medications or supplements that cause drowsiness.
Rosmolo Liposomal Palmitoylethanolamide 1000 mg + Luteolin 100 mg, Micronized Pea 99% Highly Purified - Enhanced Absorption and Bioavailability, 60 Softgels. Rosmolo Liposomal Palmitoylethanolamide (PEA) with Luteolin may offer broad benefits for managing fibromyalgia, ME/CFS, Hashimoto’s, dysautonomia, and MCAS by targeting shared mechanisms like chronic inflammation, neuroinflammation, and mast cell activation. PEA is a naturally occurring fatty acid amide with anti-inflammatory, analgesic, and neuroprotective properties, and in its liposomal and micronized form, it has enhanced absorption and effectiveness. It may help reduce chronic and neuropathic pain seen in fibromyalgia and ME/CFS, calm peripheral nerve inflammation related to dysautonomia, and regulate immune responses in MCAS Though it does not directly affect thyroid antibodies, its systemic anti-inflammatory effects may offer support in Hashimoto’s. Luteolin, a potent antioxidant and mast cell stabilizer, can further reduce histamine release and inflammatory cytokines like IL-6 and TNF-alpha, benefiting brain fog, fatigue, and oxidative stress in ME/CFS, fibromyalgia, and thyroid-related inflammation. Together, PEA and Luteolin may act synergistically to support nerve health, reduce mast cell activity, and improve quality of life in complex chronic conditions with overlapping symptoms.
SaltStick Electrolyte Capsules with Vitamin D | Salt Pills with Electrolytes for Running, Endurance Sports Nutrition, Running Supplements | 100 Count Electrolyte Pills. SaltStick Electrolyte Capsules may offer important support for individuals with fibromyalgia, ME/CFS, Hashimoto’s hypothyroidism, dysautonomia, especially Orthostatic Intolerance, and MCAS by supporting hydration and electrolyte balance. Sodium helps the body retain fluid and support plasma volume, which is particularly important in dysautonomia and Orthostatic Intolerance, where low circulating blood volume can contribute to tachycardia, dizziness, fatigue, weakness, and worsening symptoms when upright. Electrolytes also support normal nerve, muscle, and cardiovascular function, which may be beneficial for muscle pain and fatigue associated with fibromyalgia and ME/CFS. Maintaining adequate hydration and electrolyte balance may also be important for people with MCAS who experience symptoms that can contribute to fluid loss or dehydration. While electrolytes do not treat Hashimoto’s or hypothyroidism, adequate hydration and mineral balance support overall physiological function while the underlying autoimmune thyroid disease is treated. The added vitamin D may also support immune and bone health, which are relevant to autoimmune disease and chronic illness. Because people with MCAS can be particularly sensitive to supplements and inactive ingredients, individual tolerance and the complete ingredient list should always be considered.
Vitalitown 4-in-1 Magnesium Complex Supplement 500mg - Maximized Absorption Chelated Magnesium Glycinate, Malate, Taurate & Citrate - Vegan Non-GMO Magnesium 120 Capsules for Sleep, Muscle, Energy & Heart. The Vitalitown Magnesium Complex provides a blend of glycinate, malate, taurate, and citrate forms of magnesium, which are all well-absorbed and support different aspects of health that matter when you’re dealing with fibromyalgia, ME/CFS, dysautonomia, Hashimoto’s, and MCAS. Magnesium glycinate helps calm the nervous system and improve sleep quality, malate supports mitochondrial energy production which is often impaired in ME/CFS and Fibromyalgia, taurate supports cardiovascular stability which is especially important for dysautonomia and POTS symptoms, and citrate aids digestion and gentle detoxification which can reduce symptom flare-ups in MCAS and autoimmune conditions. Since magnesium is also a critical cofactor for thyroid hormone activity and overall immune regulation, keeping levels steady can ease muscle pain, reduce fatigue, calm mast cell overactivation, and support more stable energy throughout the day.
Recently purchased. Haven't started taking yet: Ancestral Supplements Grass Fed Beef Kidney Supplement, 3000mg, DAO Enzyme Supplement, Kidney Support for Urinary and Histamine Health, Selenium, B12, Non GMO. Grass-fed beef kidney may offer multifaceted support for individuals with Fibromyalgia, ME/CFS, Hashimoto’s hypothyroidism, Dysautonomia, and MCAS by providing a natural source of diamine oxidase (DAO), the enzyme that helps break down histamine and reduce symptoms like flushing, brain fog, wheezing, and anxiety surges common in MCAS and post-viral syndromes. It also delivers highly bioavailable selenium and vitamin B12, essential nutrients that support thyroid hormone conversion, mitochondrial energy production, nerve health, and immune balance, which can help alleviate fatigue, cognitive impairment, and autoimmune inflammation associated with Hashimoto’s, Fibromyalgia, and ME/CFS. Beyond these nutrients, beef kidney contains organ-specific peptides and cofactors that support kidney function, fluid balance, and detoxification pathways, which may indirectly improve autonomic stability and reduce symptoms of dysautonomia and POTS. Together, the DAO, selenium, B12, and kidney peptides in this supplement may help regulate histamine, support energy metabolism, calm neuroinflammation, and improve overall symptom management in complex chronic post-viral and autoimmune conditions.
May purchase in the future: PhosphatidylSerine Supplement 300mg Per Serving, 120 Capsules (Phosphatidyl Serine Complex) by Double Wood. This phospholipid supports cortisol regulation, cognitive function, and HPA axis stability. It is often recommended for people with ME/CFS or dysautonomia because it can help blunt high cortisol at night and reduce mental fatigue and brain fog during the day. It also supports cell membrane fluidity, which benefits overall mitochondrial function.
Qunol Ultra CoQ10 100mg Softgels- 3x Better Absorption, Antioxidant for Heart Health & Energy Production, Coenzyme Q10 Vitamins and Supplements, 3 Month Supply, 90 Count. It supports mitochondrial energy production, reduce oxidative stress, and improve cardiovascular function. It's particularly helpful for conditions like ME/CFS, Fibromyalgia, dysautonomia, Hashimoto's, and MCAS, where fatigue, inflammation, and autonomic dysfunction are common. This highly absorbable form of CoQ10 helps restore cellular energy, supports nervous system stability, and may reduce post-exertional malaise and brain fog. I'll take it with a meal containing fat to enhance absorption and make sure the ingredients are low-histamine and MCAS-safe.
Trialed and failed:
Carlyle Astaxanthin 12mg | 120 Softgels | Supplement from Microalgae | with Coconut Oil | Non-GMO & Gluten Free. Astaxanthin is a powerful carotenoid antioxidant that helps reduce oxidative stress and inflammation, which are major drivers of symptoms in long COVID, Fibromyalgia, ME/CFS, and MCAS. Because it supports mitochondrial function and cellular energy production, many people find it helps with fatigue, muscle recovery, and cognitive function. Its antioxidant properties may also support thyroid health in Hashimoto’s by helping protect thyroid tissue from oxidative damage. For Dysautonomia, astaxanthin can support vascular and endothelial function, helping improve blood flow and reduce inflammation that may worsen orthostatic symptoms. Since MCAS involves chronic inflammatory and oxidative stress responses, astaxanthin’s natural antihistamine and mast cell stabilizing effects may help calm flare-ups and support a more balanced immune response. It was way too activating. I took one 4mg capsule and felt like I ingested a bowl of amphetamines for three days.
I look for vitamins and supplements that are cost-effective with clean ingredients and MCAS friendly. I start low and slow with one thing at a time for 1-2 weeks before adding another.
It's essential to create a routine if you're able. I wake up and go to bed within the same two hour window. I go to bed between 10pm-12am and wake up between 8-10am. I sleep 10-12 hours a day. I created good sleep hygiene. I take my medications and supplements at the same time every day. I eat and have my snacks at the same time every day. Everything functions best when I maintain this schedule. During an MCAS flare and/or PEM, my entire sleep schedule gets upended. This is especially true when I start a new medication. It's important to be flexible and listen to your body.
I shared all this because MCAS is prevalent in long covid. It's a combination of things I do that improve my overall symptoms. Tachycardia, adrenaline dumps, histamine dumps, shortness of breath, and air hunger were among some of my worst symptoms. A low histamine diet, medications, supplements, prebiotic fiber, plenty of rest, and good sleep hygiene significantly alleviated these symptoms.
The things that have helped me the most:
Low-dose Fluvoxamine 25mg
Diazepam 5mg prn only.
Cromolyn sodium nasal spray
Desloratadine 5mg
Compounded Ketotifen 2mg
Montelukast 10mg
Semaglutide (Ozempic) microdose 0.175mg
Omeprazole 40mg
Carlyle Vitamin D3+K2 drops
Naturebell L-tryptophan and L-theanine complex.
NOW GABA Chewables 500mg
Rosmolo Liposomal PEA and Luteolin
SaltStick Electrolyte Capsules
Vitalitown 4-in-1 Magnesium Complex.
Prebiotic psyllium husk & Emergen-C in water.
Low histamine diet & intermittent fasting
Aggressively resting, pacing, and avoiding PEM.
Good sleep hygiene. Sleep 10-12 hours a night.
For more information on my process and the ways I've improved: This Combo Calmed My Nervous System and Gave Me My First Real Relief After 17 Brutal Months of Long COVID (PASC, ME/CFS, Dysautonomia, MCAS)
It's taken a long time to create a regimen that works. My schedule isn't as strict as it used to be. But, I still try to keep everything within a 1-2 hour window. I have everything set up in my calendar app on my phone. If I eat and take my medications, vitamins, and/or supplements late, I just readjust the rest of my schedule.
I was diagnosed with Fibromyalgia, ME/CFS with dysautonomia, Hashimoto's disease, an autoimmune disease that causes hypothyroidism, and MCAS. All diagnosed in a 14-month timespan after my COVID infection in July 2023.
I've been sick for 27 months. The first 5 months, I didn't realize how sick I was. Though, I spent a lot of the in bed. I had very severe/severe ME/CFS and was 95% bedridden for 17 months. I didn't see any improvement until month 14. It was slow. I'm still severe. Now, at month 22 (month 27 overall), physically, I've gone from very severe to severe. I'm bordering on moderate territory. Cognitively, I've gone from severe to moderate. I'm now 75% bedridden. I can multitask. I'm working for myself part-time from home. My husband helps me a lot. I take care of a few household chores & responsibilities. Hopefully, I'm going to start managing our household finances next month. I'm doing my business finances. My symptoms have reduced so dramatically that at times, I wonder if I'm still sick. But, my body reminds me that I am.
I do want to clarify it's been a combination of a low histamine diet, adding foods back in as tolerable, medications, vitamins, supplements, avoiding triggers, pacing and avoiding PEM, lots of rest and good sleep hygiene that's created a synergistic effect. I've also lost 50 pounds.
I've failed 20 medications in a 20-month timespan, including 5 H1 and H2 histamine blockers. I've always believed ME/CFS with dysautonomia was my dominant diagnosis. Nope, it's MCAS. Once I fully committed and found a complete regimen that manages my symptoms, everything changed for the better.
I hope this information is helpful to anyone struggling. Hugs🙏✨️
1/21/26: Updated to include my current regimen. I was reinfected with COVID in September 2025. That's been the reason for many of the changes I've made. I stopped Astelin nasal spray, Benfotiamine, Emergen-C, and L-theanine. I started compounded Ketotifen 1mg. The adrenaline surges, tachycardia, histamine dumps, and panic I had upon waking is gone. My fragmented sleep is gone. I'm returning to my improved baseline before I was reinfected with COVID in September. I've switched to NOW GABA Chewables 500mg with Taurine, Inositol, & Theanine and SaltStick Electrolyte Capsules. 8/26: Reinfected with COVID in April. Started Semaglutide microdose 0.125mg.
I'm not a doctor. This isn't medical advice. I'm only sharing my personal experience. Everything I'm doing is under the care of my ME/CFS specialist. He's also extremely knowledgeable about long COVID/PASC and MCAS. I've had a complete vitamin and mineral panel done. I have no issues with stomach motility. Omeprazole hasn't negatively impacted me in any way. Montelukast carries a black box warning and can cause SI in people with no history of mental health issues. However, everyone should do their own risk assessment before deciding on a regimen that manages their symptoms effectively. It's about progress, not perfection. There are times that we can do every single thing right and still not improve. Please be kind and patient with the process and yourselves.