I am very sensitive to caffeine. It gives me heart palpitations, waves of anxiety up and down my body, and the shakes when I am coming off of it. One time I went to an event, and was offered some Mushroom Coffee, which supposedly had half the caffeine of regular coffee. I was given a small sample, which was about half of a regular styrofoam cup full. Not much! I had a HUGE reaction to that coffee! It was supposed to have Maitake, and some others in it. A few years later, I ate some morels, and had a similar, but milder reaction, this time without the coffee. I have never had this reaction with button, portabella, puffball, nor Shitake. Anyway, just curious if anybody else has noticed this kind of reaction to mushrooms, or if any mushrooms are known to have caffeine?