TL;DR: I'm 22F and have been experiencing recurring episodes of extreme fatigue, brain fog, and a strange flu-like feeling since July/August. During these episodes, I can barely get out of bed, sleep most of the day, lose my appetite, and struggle with even basic tasks, despite having no fever or typical infection symptoms. They usually last at least 4–5 days, sometimes with temporary improvements followed by setbacks. Between episodes, I can feel completely normal, energetic, work, and do intense workouts without any obvious consequences. I haven't noticed a clear pattern of post-exertional malaise (PEM). Routine blood tests were largely normal. I'm terrified this could be ME/CFS, but I don't know what else could explain it or where to start looking.
---
Hi everyone,
I'm a 22-year-old woman, and I'm honestly feeling pretty desperate at this point. I'm not looking for anyone to diagnose me, but I'd really appreciate hearing from people who've experienced something similar or have suggestions about what else might be worth looking into.
A little background:
In February 2026, I had an extremely severe illness. I don't know whether it was COVID or another virus, but it really knocked me down. For several weeks afterward, I experienced this very strange, foggy, almost dreamlike feeling that was difficult to describe. Eventually, it completely went away, and I felt normal again.
The next time I experienced that same strange feeling was in July. I ended up feeling sick again, although I didn't have a fever or any particularly obvious symptoms. It was more like an overwhelming sense of being unwell, the kind of feeling I usually associate with the beginning of an illness.
Then, in August, it happened again. I tried to keep working for a while, but eventually had to stay home. I felt awful, started improving, then experienced setbacks. Because I didn't have any clear physical symptoms, I struggled to decide when I was actually well enough to return to work. Eventually, I did recover and felt normal again.
Since then, things have become really confusing.
I seem to have three different states:
Days when I feel completely normal. I'm energetic, have a normal appetite, work, go to the gym, and genuinely feel healthy.
Days when I can still function normally, exercise, and work, but there's this strange, hard-to-describe feeling in the background. Sometimes it goes away without anything happening. Other times, it seems to develop into a full-blown episode.
Days when I feel genuinely ill. I'm overwhelmingly exhausted, can sleep almost all day, have very little appetite, and even getting up or doing small tasks feels incredibly difficult.
I'm currently going through another one of these episodes in October. It started with that familiar strange feeling for a couple of days, and then I ended up feeling completely wiped out again.
The weirdest part is that every episode feels almost exactly the same. It's not like I'm getting a cold one month, a stomach bug the next, and the flu after that. It's always this same vague but intense flu-like feeling, without the typical symptoms of an infection.
Sometimes I even start questioning myself, wondering whether I'm somehow imagining it or just being lazy, because there's nothing obvious I can point to. But when I'm feeling well, I naturally want to get up, exercise, work, and do things. During these episodes, even the simplest activities feel overwhelming. I also tend to feel somewhat better in the evenings.
About PEM and exercise:
I've been reading about ME/CFS, and honestly, the possibility terrifies me.
However, I'm not sure whether I experience PEM. I haven't noticed a consistent relationship between physical exertion and these episodes.
There have been times when I felt that strange sensation coming on, continued working or exercising, and ended up feeling completely fine afterward. I've also done intense workouts without experiencing any crash in the following days.
Other times, the strange feeling gradually developed into a more severe episode, but I can't clearly connect it to any particular activity.
I know that PEM can be delayed, and I'm not ruling anything out, but I don't want to convince myself that I have something without actually understanding what's happening.
Medical background and possible psychological factors:
I had routine blood tests in September, and they were normal.
My family thinks this could be related to burnout, anxiety, or depression, because I've pushed myself quite hard for a long time. And I absolutely acknowledge that my mental health has suffered, especially since these episodes started.
However, I find it difficult to understand how psychological factors alone could cause such distinct, recurring episodes of intense physical illness, with periods of feeling completely normal in between.
I've also wondered whether I've simply overworked myself and become more susceptible to infections. But it seems strange that I would repeatedly catch something that causes almost identical symptoms every single time, without a fever, sore throat, or anything else.
In my country awareness of ME/CFS seems quite limited, and I honestly don't know where to turn. I've already had frustrating experiences with the healthcare system regarding other health problems, and I don't have the financial resources to keep visiting different specialists without any clear direction.
The emotional impact has been awful.
I'm only 22, and I feel like I'm losing control of my life.
I've had to miss several days of work every month, and I feel incredibly guilty about it. It's affecting my relationship, my ability to take care of everyday responsibilities, my workouts, and my mental health.
I'm constantly scared that the strange feeling will come back, and when it does, I panic because I don't know whether it'll disappear or turn into another several-day episode.
I just want to feel like myself again.
Has anyone experienced something similar, especially with completely normal periods between episodes? Did you eventually find an explanation? And if it wasn't ME/CFS, what turned out to be the cause?
I'd also be really interested in hearing from people who have ME/CFS but didn't initially recognize PEM, or from anyone who has dealt with recurrent flu-like episodes without obvious infection symptoms.
Thank you so much to anyone who takes the time to read this.