Hey,
I was diagnosed a few weeks before starting college. Luckily, 6 Asacol/day was enough to get me into remission at that time. I hope Asacol is enough for you, too (although it would still be a good idea to take rectal meds). Do you know how extensive your UC is (entire colon, left-sided, or just rectum)?
Some people notice that certain foods exacerbate their symptoms, and some people don't have problems with foods. I'd suggest keeping a food diary for a month or so and track your symptoms as well.
You should register with your college's Office of Disability Services. They'll need a letter from your GI explaining what UC is and what accomodations you'll need (extended test time b/c of bathroom breaks, missing classes if too sick or for doctors' appointments, etc.).
This darn disease definitely gets you emotionally. I've had it for 3.5 years and am in clinical remission, but I still struggle with it. If it's possible, talking to a therapist might help. Don't overextend yourself and don't stress out (easier said than done, I know). Also, as great as HealingWell is, don't read all of the threads, or keep in mind that people who are the most sick are the ones who usually post, and it might freak you out.