The day I went in to get my tooth fixed I didn't have but one Diet Coke, no coffee/tea or whatever, and then I woke up with a headache on the other side of my face. I was all "wtf" and went to work, still not drinking any caffeinated beverages b/c of the temperature sensitivity fear, and it just got worse and worse till I thought I was going to vomit. So I went home early and Reg gave me a Dr. Pepper and some advil and that seemed to actually help. This morning I woke up with the head still hurting a bit, jaw not even worth complaining over, and coffee has helped tremendously. So, I guess it's official: I'm addicted to caffeine.