I'm so sorry to hear about how difficult it has been for you upon your return to school. Please remember that 5 months is still early in the recovery process.

I am a college professor and have been dealing with PCS/etc. for 7 months now. I struggle with the same issues but have decided to take this entire year off in order to recover. (We don't just read lectures out loud, and the crowds are too much!).

At my university, there is an accessibility office for students with various learning issues as well as physical disabilities and psychological challenges. As the other poster said, if you go to this office with documentation, you can petition to have different types of tests (i.e. in quiet rooms vs. large lecture halls), more time to take tests as well as the note taking services, etc.

I have always tried to work with students, but I can imagine how hard it is when you encounter professors who won't be flexible. Perhaps you can work with your professors on having reduced work load, different schedule of assessments or other ways of assessment that are not too taxing as you recover.

I'm not sure what your financial aid situation is like, but perhaps you can also take a reduced course load/ number of classes.

Hang in there-I hope you find some accommodation that works, or if need be take more time off.