Thank you for the responses. It could possibly be the fatigue which is causing the lack of concentration and I'm thinking you're right that elevation changes might be a trigger.

I don't take prednisone because of bad side effects, and the only medication I'm taking is Pyridostigmine.

I did forget to take my CoQ10 for several days, but I started taking it again and this feeling still persists. I take the CoQ10 for high blood pressure. It's not too high yet to take meds, so I'm trying to get it down with the CoQ10 so I don't have to start taking the meds.

Maybe I didn't drink as much water as normal, but I'll make an effort to keep hydrated.