Your opinion...anxiety, maybe something else?

What up y'all? I need everybody's opinion on this. I think I have been experiencing symptoms of GAD or social anxiety for many years now. When around other people I often feel uneasy, like people are paying attention to me (although I know this is not true); it is just an unpleasant feeling that I can't shrug off. For instance, I could be walking down the street, and a stranger is approaching my direction, just minding their business. I won't be afraid of the person, like I am in danger or anything; I just begin to feel a discomfort. Even if I'm just sitting in church this can happen. To avoid this feeling I try to keep to myself when in public. For instance I just avoid eye contact with anyone; but this is not something I enjoy doing as I feel uncomfortable doing that too, especially when I am at college, because I know many people and I'll often walk by people I know who end up thinking I'm ignoring them, or I just seem 'zoned out' doing this according to friends.

Here's the part that makes me question whether it is simply anxiety, social anxiety, or if there is something else wrong. I don't always experience these problems. More often than not I do have these problems nowadays, but many times I will not have them at all. I might be in a situation where I have these anxieties, and another time be in the same situation and have none.

Another weird problem I have is that often I experience 'brain fog'. I feel like my thoughts are clouded and I am unable to think clearly or focus. I got a full scholarship to college, and lost it after one year because of this. Sometimes I would feel fine; my logic and cognition would be fully intact. Othertimes I will take a complete 180 and feel all my intelligence depleted; my logic and creative thinking completely disappear. I have not been able to trace what might cause all of these things to happen.

I have seen many specialists and have had many different tests done to make sure there is nothing physically wrong with me. The only thing I found is that I have central sleep apnea (condition where one stops breathing repeatedly during sleep because the brain fails to send the signal to do so). I do not know if this relates to any of my problems.

I will also say that all my life I have been one to tire and fatigue easily. I am very physically fit and don't understand why this happens. I don't have asthma or anything.

Any input is greatly appreciated.

To me from what I've read (and I'm not a professional) since you feel uncomfortable in crowds, can't look people in the eye, that you could be experiencing some social anxiety.