I should also add, I have learned to follow the advice "If it makes your symptoms worse, stop doing it." So if classes are making you worse, you need to stop.

A neurologist can provide documentation you can provide to your university. Most universities are very understanding. I had to stop in the middle of my spring semester. My advisor has it set up with my professors that when I am ready, I can continue with the end of my spring courses through online coursework, so that I can still receive credit.

Check with your universities disability services and with your student advisor.