Yeah, sounds like the caffeine; I use to get those headaches when I'd get an urge to get "healthy". Takes about 2-3+ days to get over them. http://www.energyfiend.com/caffeine-...mptoms-top-ten

I had my DNA tested for caffeine metabolism (who know there's "slow" and "okay"?) and am a slow metabolizer. What that means is I should only have 1 cup or so a day or risk heart problems. http://www.energyfiend.com/caffeine-metablolism