I don't think it's the lack of caffeine. I finally finished my tapering program for benzo addiction. I took my last tiny dose last week. I was doing just fine until yesterday... I am guessing that the last of the drug has finally worked its way out of my body and now my brain is freaking out. I am really paying attention to my body today - everytime I feel a muscle tense up I stop and try to relax it. It's probably going to take awhile... I am thankful I am free of all chemical dependence...