Dear cebloom,
I hear you, and have had the same reaction to Excedrin. I even called Poison Control because I was so ill. I would advise you to see a neurologist and inquire about other treatment possibilities. For one thing, Magnesium Oxide(800mg/day) taken one at night - it relaxes the body - and one in the day, can have a good effect on migraines for some people. There is also Butterbur. Look at this: http://www.raysahelian.com/butterbur.html. I'm going to look into it myself, because I prefer to avoid the side effects of Rx drugs. If you are a student, you probably have access to counseling. You should definitely take advantage of that and talk to someone about your thoughts and feelings.
All the best to you, SusaC