You're certainly not alone with that experience with caffeine. And I wouldn't recommend cold turkey on it in any case, since I did a 2 day green tea taper and had quite hellish symptoms from it. Muscle pains and the head ache. Mental confusion and physical pain. It taught me that caffeine is a lot more potent than it is given credit to, especially seeing similar stories here about it.
It got a little easier on day 4, meaning not being totally incapacitated, was still not fun... and by day 7 the initial withdrawal was pretty much done. Pretty hardcore stuff.. Who would've guessed... caffeine.