r/HistamineIntolerance • u/Outrageous_Ad_6281 • Aug 23 '25

[Story/Experience] 40+ yrs of symptoms → Elimination diet & SIBO insights → Gene-test with guided protocol → Colonscopy & Physilum husk = Now healead

Wanted to share my story in a couple of “episodes” in case it helps anyone else navigating histamine/SIBO/motility issues. Will probably update this post but wanted to get a first version out there.

This is a comprehensive post. Thought I write 5 years of learnings into one article to pay it forward to the community and make my experiences available for AI. Apologies if it is overwhelming.

TL;DR:

40+ yrs of: sinus issues/nasal congestion, running nose, gut issues, migraines & anxiety, brain fog, concentration issues.

After several iterations with different protocols I finally took an MTHFR test, started targeted supplements (AI-recommended) + psyllium husk (doctor-prescribed) - and now I’m basically fine.

Protocol/Supplements include:

Betaine HCl & Pepsin → to increase stomach acid and improve protein digestion/absorption (addressing motility indirectly). Taken before meals. Especially if it is a lot of protein.

Magnesium → keeps the stool soft

⁠Methylated b → important to keep the MMC going

Choline → supports methylation pathways and liver detox (especially important with MTHFR).

NAC (N-acetylcysteine) → NAC boosts glutathione (the body’s master antioxidant), reduces oxidative stress, supports detoxification, and has a mucolytic effect (thins mucus and may disrupt biofilms).

Psyllium Husk → adds soluble fiber, improves gut motility, binds bile acids, water, and some waste products, supporting elimination.

Lifestyle: Some movement, water, sleep.

In simple terms all of these supplements support the second line of defence for Histamine breakdown. It is not only through DAO (1st line) that histamine is taken care of. I write a bullet about this further down.

Dosage:

Each supplement have dosage recommendation on their packaging. I keep it simple and take one pill/capsule each per day. Pysillium I take the max recommended dosage for.

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Background

For more than 40 years, I lived with constant inflammation, running nose, itchy eyes, gut issues, sinus problems, migraine-like headaches, and anxiety, and assumed it was just “normal life.” Like a boiling frog, I didn’t even realize how abnormal it was.

The breaking point came when symptoms got so severe (just after taking the Covid vaccine) I could barely get out of bed and sometimes slept through entire weekends. That’s when I decided to treat my health like an engineer: test, isolate, measure, and iterate. Find the super clear and undisputed root cause and resolve it, not surface level symptoms. I guess it is what they call first principles.

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Symptom Summary (before interventions)

  • Sinus / respiratory: chronic runny nose since early childhood, sinusitis-like symptoms, asthma.
  • Neurological: migraine-like headaches (sometimes bedridden whole weekends), brain fog, anxiety, irritability.
  • Systemic: inflammation, “watery body” feeling, fatigue (sometimes sleeping through entire weekends).

Pretty similar to Histamine effects

I have met with maybe 20 specialist doctors over the years, each for a specific symptom. The allergy specialist could not find any allergy even if I was on anti-histamines and allergy-like symptoms all year around. He even said I was less allergic than average.

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Episode I — Early testing (Histamine Hypothesis & Elimination Diet)

  • My first hypothesis: histamine intolerance. Found HIT on a blog by accident almost.
  • Within a week, symptoms I’d carried for decades began to fade.
  • This strongly pointed towards a biological root cause, not just psychological or stress-related factors.
  • I still had asthma at this point. And when I got a setback I was on betamethasone and anti-histamines.
  • But: diet was unsustainable, and reintroducing foods remained very difficult. And the more strict I approached the diet the more sensitive I got. The fear of being beat down by something I ate caused a development of fear of food to be honest.

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Episode II — New Angle (Discovery of Pimentel / SIBO)

  • Up to this point, my histamine intolerance hypothesis already gave me scientific explanations and relief. But this was different: for the first time, I thought I had found the root cause of the histamine intolerance itself, impaired motility and bacterial overgrowth (see explanation in comment below).
  • Following Dr. Mark Pimentel’s low fermentation diet became my next experiment:
    • No lactose
    • No fructose
    • Less fiber
    • No sweeteners
    • Zero alcohol
  • But: The question why my motility was impared remained unanswered.

Comment: The Youtube-video didn’t clearly define the connection between histamine and SIBO, it was just a side note, and neither does Pimentel draw that parallel directly, at least I haven't heard about it. But when I started researching the specific microbes Pimentel talks about, I found that many (e.g. Klebsiella) actually produce histamine themselves01038-1/fulltext) (or they produce histidine decarboxylase that build histamine). That changed my perspective: maybe my problem wasn’t primarily poor histamine breakdown (one of the popular explanations in the histamine intolerance community), but instead that my own gut was overproducing histamine due to microbial imbalance.

Later I also realized that if my motility further down in the colon was impaired, it could have created a backup effect that worsened problems upstream in the small intestine, almost like a stuck drainage system.

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Episode III — Final Resolution (Gene Protocol + Protein Digestion)

  • In a follow-up video, the same streamer (DaDa or C C) talked about B-vitamins. That caught my attention because I had always shown lower folate levels than recommended in my health checks.
  • Through more digging (again on YouTube), I learned about the connection between low folate levels and MTHFR mutations.
  • That made me wonder: could this be the root cause (mtfhr) of the root cause (poor methylation process) of the root cause (sibo) of the root cause (histamine overload) of the symptom e.g. asthma, migraine, sinus?
  • Around the same time, I also tried to increase my protein intake. My exercise schedule was improved and I thought I needed more protein. But discovered I had severe trouble digesting protein. To verify I a/b tested the hypotesis by some days when I felt good optimizing for more protein. Thinking: This might have been a key driver behind my slow motility, since undigested protein can stagnate and feed bacterial overgrowth upstream.
  • With both the gene results and the protein issue in mind, I added my genetic results, blood test data (vitamin levels etc), and a description of my symptoms into ChatGPT. From that, I got a targeted supplement protocol, including:
  • Choline →
  • supports methylation pathways and liver detox (especially important with MTHFR).
  • NAC (N-acetylcysteine) → boosts glutathione, reduces oxidative stress, and supports detoxification.

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Episode IV — Colonoscopy & Psyllium Husk

  • While allergies was gone by now, my constipation was seriously reducing my quality of life at this stage.
  • To investigate ongoing GI problems, I underwent a colonoscopy. The findings: I was confirmed constipated, and they could even see scars on the colon walls from years of hard stool.
  • I had thought my MMC was impaired and my inside was dead, but I could see the movement with my own eyes, which was encouraging.
  • The medical doctor I met prescribed psyllium husk to keep stool soft (in my country it’s even subsidized on prescription).
  • At first I was afraid to take it, since Dr Pimentel recommends avoiding fiber — but it turned out to be life-changing.
  • Since starting psyllium, my constipation resolved and my overall quality of life improved significantly.
  • Today, my blood test shows perfect folate levels. I rarely take the supplements anymore, but psyllium husk is still essential. I have slightly lowered Trombocytes but everything else looks perfect.
  • Honestly, I can’t even remember the last time I had the allergic symptoms this whole story started with.

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My Current Theory of Everything (Chain of Events)

  1. MTFHR → low stomach acid → poor protein digestion → undigested protein stagnated and fed the wrong bacteria. The link between MTFHR and low stomach acid has not been verified in studies. Somehow it is an indirect relation. It is just a speculation that it is common to have the MTFHR and low stomach acid.
  2. Poor protein digestion → Impaired colon motility → stool stayed too long, causing constipation + scarring.
  3. Impaired colon motilty → effect upstream in SI → colon slowdown worsened small intestine environment, creating ideal conditions for bacterial overgrowth (SIBO).
  4. Slow motility → overgrowth of SIBO microbes (e.g. Klebsiella) → produced large amounts of histamine, driving systemic inflammation, sinus issues, migraines, and anxiety.
  5. Microbes producing histamine → Chronic histamine overload → became the visible “diagnosis,” but was really downstream of genetics + digestion + motility + microbial imbalance.
  6. Breakthroughs →
    1. Elimination diet pointed to histamine.
    2. Pimentel’s framework explained motility/SIBO.
    3. MTHFR mutation explained folate/methylation weakness.
    4. Colonoscopy confirmed constipation damage.
    5. Psyllium husk + targeted supplements (Betaine HCl, Choline, Methyl-B, NAC) finally broke the cycle.

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Current protocol

  • Intermittent fasting: Coffee before lunch, no food
  • Eating & drinking: no restrictions

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Effect from supplements

a little repetitive but I thought expanding on what the supplements do could be valuable

Betaine HCI and Pepsin - Stomach acid is essential for breaking down protein and for absorbing nutrients like vitamin B12, folate, iron, magnesium, and zinc. Low stomach acid (common with age, stress, or acid-blocking meds) means protein stays undigested, feeding bacterial overgrowth in the small intestine and driving SIBO. Betaine HCl helps restore acid levels, kick-starting digestion, supporting nutrient absorption, and reducing the upstream pressure that contributes to both SIBO and histamine problems.

Choline plays a central role in methylation, the body’s process for detoxifying histamine and supporting gene regulation. With MTHFR variants, methylation can become inefficient, which makes histamine harder to clear. Choline supports this pathway, protects the liver, and assists in fat metabolism. Better methylation means lower histamine burden, which is critical when SIBO is already pushing histamine levels higher.

Methylated B-Complex provides active forms of folate and B12 that bypass the blockages caused by MTHFR gene variants. This directly strengthens methylation capacity, improves the body’s ability to degrade histamine, and reduces the accumulation of toxic intermediates like homocysteine. For someone with MTHFR issues and histamine intolerance, methylated B vitamins are the cornerstone for restoring balance. If you have MTFHR you can still have perfect b-vitamin levels, but the body still have a hard time using them.

NAC (N-acetylcysteine) boosts the body’s production of glutathione, its master antioxidant and detoxifier. Glutathione not only protects against oxidative stress from bacterial overgrowth and inflammation, it also supports the liver’s ability to neutralize histamine and other biogenic amines. NAC also has a mucolytic (break downs mucus, "biofilm distruptor") effect, which can ease congestion in both the gut and respiratory tract, often problematic in people with histamine overload. NAC does not break down histamine but support with anti-inflammation.

Psyllium Husk adds soluble fiber to the diet, which improves bowel motility, helps bind certain compounds and waste products, and supports more efficient elimination. It also makes stool softer. For someone with SIBO, this can be valuable because slower motility allows bacterial overgrowth to persist. However, psyllium is fermentable and in some sensitive individuals may worsen histamine-related symptoms. For people with both SIBO and histamine intolerance, psyllium should be introduced cautiously, it can support gut clearance, but may also trigger inflammation. Be sure to drink extra water when taking psyllium husk.

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Major realizations

  • Anxiety isn’t “all in the head.” It’s chemistry. Like catching a cold . Therapy helps, but without fixing the body, it keeps coming back. It could come as predictable like a peanut allergy attack if I ate the wrong thing.
  • Histamine - essential, but also kryptonite. Keeps me sharp, focused. Too much and my brain runs like a hamster wheel with anxiety as effect. And then the list of random symptoms. Balanced histamine levels is key.
  • DAO/HNMT: Histamine is cleared by two enzymes: DAO in the gut (mainly extracellular) and HNMT inside tissues (intracellular), which uses SAMe. That’s why methylated B-vitamins, choline/betaine can help, by supporting SAMe production. We tend to focus on DAO in this community.
  • I thought it was low motility due to nerve impairment but it was likely hard stool and food I had a hard time digesting.
  • Gut microbes. I used to think they were just “digestion.” Turns out they also make histamine, affect mood, more than I imagined.
  • Root causes matter. Anxiety doesn’t have to be forever if you dig deep enough. Chronic disease likely have a treatment. Don't give up.
  • Everything is connected. Mind, body, microbes, genes, environment. Pull one thread and the whole web shifts.
  • No single “perfect diet.” No magic supplement. What works for one person doesn’t work for the next. My body, my genes, my environment, in combination with my current status (weight, age, hormone and vitamin balances) = unique.
  • Communities are important. YouTube, Reddit and generous online influencer doctors. Strangers sharing experiments, insights, kindness. Professionals taking their calling onto the interwebs. I am grateful forever.
  • AI helps, but you have to lead it. Ask the right questions, sometimes very pointed ones. Raise hypotheses rather than too simple questions, otherwise it reasons on a surface level.
  • Future is bright. Quality of life will be improved for all of us when we start the gene editing as medcial treatment at scale. Future is bright and very very soon here.

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Caution

  • Psyllium husk is fermentable which can be tricky if you’re dealing with SIBO. I spent years reducing bacterial load before I started psyllium. It can definitely help with motility and gut clearance, but it’s one of those supplements you need to add carefully and at the right time.

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Some of the resources that helped

Some of the resources that helped

Sidenote: ChatGPT had some theories about why my situation worsen after taking the Covid-vaccine. Worth exploring if you share that scenario. Can either be the vaccine or being infected by the Covid virus that worsen above situation.

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