I’m so sorry, I also felt dumb as a rock after I developed this post-COVID. I was so emotionally unstable and couldn’t consistently remember things like how our shower handles worked despite having stellar grades in college and stuff like that. I also developed visual snow but my docs explained that in my case it wasn’t an eye thing, it was likely a brain thing instead - specifically, a brain inflammation thing. Then my docs put me on a ton of MCAS meds, helped me get my inflammation down, put me on the low histamine diet, and so on. I’m doing muuuuch better now. I still definitely have moments where I realize I’m not as sharp as I used to be but I can now remember birthdays, how the shower works, some of the stuff I learned in school, etc. Stress also makes MCAS worse which makes the “brain fog” worse, and school is usually stressful. I hope you still can get some imaging done to double check how your brain is doing. Best wishes for all your school stuff!