Howdy,
Here are some tricks I have picked up while going to a major mid western university in the U.S.

Register with your schools office of disability services. All that is usually required is a letter from your doctor stating what your condition is, and how it affects your daily life. Also a list of medications is helpful as some will may cause you to be drowsy and some teachers may take it as your sleeping in class when your having a reaction from your meds. Using your schools office is confidential. And it allows you certain privileges like taking your exams in a separate office or extended time. The counselors you will work with are usually social workers so they know what to look for and understand confidentiality.

Get a planner and put all assignments in it and when they are due.

keep in touch with your teachers when you have drs appointments. All you need to say is "I will not be in class today due to a drs appointment". Get a letter from your dr, take it to your ODS counselor, and they will notify your teacher you were at the drs and won't know what kind of dr it was.

If you have an iphone, Blackberry, or Android, put class time,location and drs appointments into the calenders. They usually have a reminder option which is helpful.

Also communicate with your professor if your having a bad day and need a break due to your disability..

Good luck