Been feeling very fatigued, weak, brain fog for the past 3 weeks. To the point that I can barely get out of bed for most of the day.

I have been improving the past 3 days so it's feeling like I may be on the mend but progress is SLOW.

No idea what this is. Doctors have done blood tests, Brain MRI, x-rays, etc. All normal.

I suspect something like Long Covid or some other Post Viral Syndrome.