Well it could be an allergy, but who knows.Allergy to caffeine? For a lot of years, I would actually get 'stoned' off coffee. In younger days, we would go to a coffee house before partying on a Saturday night and having one coffee would have been the equivalent of a 'yellow jacket' or 'bennie' for me. I guess over the years, I have built a tolerance to caffeine, but even now I can sometimes tell if I am feeling hyper or aggressive it's because I had a coffee a half hour ago.
Coffee and morning traffic on the Gardiner don't agree with me.
I get shaky, extremities start to tingle, really bad nausea. Not fun at all.
I can have coca cola and it doesn't happen though.