Feeling like I'm starting over again

For the first time in years I felt okay. I was on meds, I was going to therapy, and working a full time job. It was a little scary but I decided I was ready to go back to school. Now it feels like a huge mistake. The meds don't seem to be working anymore. I feel like I took a huge step back in therapy progress. I'm even back to seeing my therapist once a week. It's only week 2 of classes ... there are 16 in total. I wanted to not give up on my degree but that means a few more semesters (a year+). I am taking a class that I've previously failed 3 times. This is my last shot to take it or I'll have to take it somewhere else and explain to my parents that I failed the class 3 times or pay for it myself. I feel like I have to start over absolutely everything.