Brienne, I had the same troubles when studying to become an accountant. For my first 5 classes, I was either hypomanic or stable. In 1982, I had the highest mark in my province for Economics and won a medal.
In 1984 we moved 300 away miles from home. I fell into a depression and could no longer study. I took calculus twice and didn't even try to write the exam because I knew I'd fail. My brain fog was so bad that I couldn't understand it at all. (My final mark in grade 12 algebra was 97%, so my intelligence wasn't the problem.) It was depression. It was 3 more years until my depression was diagnosed, but I had quit my accounting classes by then and didn't go back. My career would have been a lot different if I'd continued once I was happy again. I could have made twice what I did as an accounting clerk. I was turned down for many jobs because of my lack of a diploma, even though I had extensive experience.
The imipramine I was given in 1987 made me hyperthymic, sometimes to the point of hypomania. I should have gone back to my studies, but I had 2 small kids, a full time job, and a husband who traveled for work. Bad excuses, I know. Other people do it.
Keep the faith. You can prevail. Give your moods time to adjust. Take time off from your studies if you can and then go back.
I have deep regrets about quitting my accounting classes. Do only what you can, and do your best. My best in 1984 was depression and brain fog. I hope you can overcome your issues, not like me.