I found a chicken or egg dilemma... Did I drink to slow down mania or did drinking make me speed up? Not sure but spent waaaaay too long in hypo manic/ mixed states and using alchohol to self medicate (I wasn't diagnosed/ on meds til recently). Like half a year at a time ending up ruining my work references and jumping on a one way flight to Bangkok too-long. Regarding sex, manic + drunk = eeww regrets now.
For me I've decided to try my very best to get well. The doc said two drinks a week max, I did as I was told. Then he asked how about none? I feel happier for it, though probably starting crazy Pills for the first time plays a part.
It is hard to quite drinking at uni. I quite weed at uni when all my mates were doing it. The thing I found the most useful was telling my close friend/flat mate that weed was making me crazy and asking him to make sure I didn't have any, no matter how drunk/
Manic I was. It worked, and even now six years later if peoplear smoking pot and I'm there he'll send them outside so I don't have to smell it. Like a bodyguard for the brain.
Good luck

. you'll do well, is great you are sorting this out for yourself.