Man, I couldn't do it. I tried and was the biggest bi*ch on the planet and had massive headaches too. I wish I could give it up but I just can't. I do know, however, that those are just withdrawal symptoms. You can treat them with tylenol or midol or something like that until they go away, but they won't be around forever. Kinda like when we went thru the carb withdrawal. It sucks for a bit but I hear it does go away eventually. Let us know how it goes. If you get thru it and feel better than when you were on caffeine, maybe I'll give it another go!