I still tried to meet all of my deadlines on time, but it has been at the expense of my health and, in retrospect, not something that I would do again. As important as each paper, each test, and each presentation may seem, nothing should come before your health. When you get to class in the beginning of the semester, check out the syllabus closely and see what needs to get done when. Set realistic goals for yourself to get your work done. Don't leave that paper or that studying for the last minute.
Procrastination is a bad idea anyway, but it has serious implications for a Crohn's patient.
Figure out what you can do to reduce the stress and keep yourself healthy. My close friends have been so important to me here. I am still learning to live with this disease, but I would have benefited a lot from better planning at the beginning of the semester. I haven't felt that sick since I was first diagnosed. It's not easy being 20, gaining a ton of weight, getting acne all over again, and trying to have a social life at college at the same time.