I think you should definitely get in touch with disability services and let them know about your condition. I think it's also important to let your professors know during the first or second class at the beginning of the semester that you have a chronic condition and may need special accommodations ie: more excuses absences, bathroom leaves and test taking accommodations.
In my experience I felt that I was treated very fairly and professors really went out of their way to make sure that I was able to complete my courses without any undue impact on my disease.