You know how you have to fast before surgery? That means NO COFFEE OR CAFFEINE! Every surgery I have ever had has resulted in a severe headache to the point of throwing up due to caffeine deprivation. I ALWAYS have a severe headache before the operation and most often still have it afterward. (Doctors don't seem to realize how much these hurt!) My last surgery was ten years ago, though. I am facing another one end of August. Does anyone else experience caffeine withdrawal? Can anything be done about it nowdays?