Im a 20 year old male and i have been suffering from intense brain fog for 3 years now.

It all started progressively while i was in highschool, i was getting anxious easily, my mental focus and stamina dropped, my memory got a bit weaker, but i thought it was the studying and school to blame.
A couple months later those symptoms started to merge. I had complete mental fog, derealazation, inability to think or make plans, physical fatigue to the point i couldnt walk a block, deep depression and melancholy. I visited various doctors with no results.

Since then, these symptoms slowly fade and im getting closer to my normal self. Although, im still at around 50% of what i used to be and im still not fully functional at work.
My ability to handle complex problems is still noticeably damaged.

I have read that food allergies or infections often cause these kind of symptoms but i guess this is not the case for me.

I came to this forum as i have lost hope with doctors and different diagnoses.
Any help from you guys is welcome
Thank you in advance