I had bad mental symptoms also. I had great difficulty concentrating, I felt lethargic and fatigued all the time ... no matter how many hours I slept. My short term memory was a joke. I did not have the mental energy/capacity to hold a conversation. Most phone calls to me went unanswered.
If someone spoke to me, I felt 'phased out' and I would be looking at them, I could see their mouth moving and could hear the words, but it was not registering in my brain. I would stare at them with a blank look, then ask "What did you say?"
Walking to my mailbox to retrieve my mail seemed like a trek up Mt. Everest.
I don't know if your mental symptoms are triggered by Lyme. I searched long and hard for triggers to my symptoms and found none. I was always sick and always wanted nothing to do but lie in bed with no stimulus.
However, I have improved with 3 years of aggressive treatment. My mind came back and I'm working a very technical job and doing a good job of it.
I know this may sound drastic, but your health is your #1 priority. Withour your health, you cannot do well in school. Is there any way you can stop your classes and concentrate on getting back to your healthy self?
Then, when you return to health, you can breeze through those classes!
The Lyme spirochetes can get into brain tissue and mess with all our neurtransmitters and glands. Don't expect more from your brain than it can do right now. You're not crazy - you have Lyme.
Have you been tested for co-infections? I found that my drunk, foggy feeling went mostly away after I treated my co-infection.
Just my thoughts. I can relate to what you're going through. Hang in there. I got better.
Peace and health to you,