Uhhh, not sure how migraines are indicative of burnout... They can happen for a number of reasons not related to studying. I get them occasionally, even on low stress days. I haven't found anything that REALLY helps, and usually end up getting a glass of water and trying to push through. The water is crucial, if I'm too dehydrated it's almost a given that I'll end up with a migraine. I picked up running a few months ago and have noticed a decrease in the frequency of my migraines, not sure if it's related to the running but it might be worth your time to give it a shot. I do agree with Alpha's advice in that if you find that you are getting them chronically while studying you should scale it back a bit.