Eagle, do the best you can for the time being. Math and Chemistry isn't easy period, ptsd or not. First of all, I can't believe your school doesn't have more counseling for their students. Having students stay in college gives them money but if you don't take care of your students, and they drop out, no money! I don't get it. The school I went to in IA, had free counseling for the whole duration I was enrolled in school. I used this several times not knowing that it was ptsd starting to stir after hibernation.

What Anthony said is true. Right now, you are heading toward the end of the semester. Get a tutor for the time being, do the best you can, and then take a break. A LONG break. Get that second job you need and start to heal yourself. Maybe with the second job, they will have decent health insurance. When you are ready, then go back to school and I suggest going to one that gives free mental health counseling. Sounds to me a lot of unweilding people at your school. If this instructor is actually a therapist, then she should know how debilitating PTSD is.

I wish you the best of Luck.