I was an undiagnosed BP when I went through uni, and it was a lot like you described!!!! (except more drinking....) the emotions were wild, huge amounts of stress and wild mood swings... (how did nobody diagnose me????)
My advice is to focus on what is in your control, what is in front of you, do the best you can then let it go. some planing for assignments and study would be good but try not to build up things into big problems.
You know you have BP so you know to monitor your moods, be careful with sleep and don't drink too much etc....
Taking some time to yourself to get your head back in shape is really important.