I would say the only way to truely tell what set it off is to have his allergies tested. When I had this done about 25 yrs ago, it was little pricks all up and down my back and arms :) I do not think they do it that way anymore BUT it is the only way to be certain. I do not think it was your Caff-Pow. I have noticed, living in Texas, that when it rains here it stirs up all sorts of Pollens, grasses, etc that I never knew I was allergic too :) I hope this gets fixed b/c I know how much your nephew means to you!! Hugs and good luck!! Staci [Posted in FML 6376]