Well I'm pretty moderate in my caffeine use. Partly because my stomach doesn't like most stuff that contains it - for example, I can drink about 1/3rd cup of (watered down) coffee a day before my GI system starts to feel like a warzone of pain.

I've a regular GI doctor, and we just completed the scopes down my throat and up - well, the other end. And they said everything looks good, no polyps to remove, they aren't even sure I really have diverticulitis, which another doctor said I probably did have.

So, I think it's weird also that I still get throbbing headaches if I go without caffeine - but I get headaches every day, so maybe the problems between my ears (a lot of people would probably agree with that assessment).