It's probably from the cystolithic hairs. Some people are more prone to digestive issues when eating cannabis. I can stomach small amounts of decarbed cannabis (< 1 gram), but not much. I guess some people have digestive issues from chlorophyll as well. I don't know if the chlorophyll is altered via vaping, maybe it is not an issue with abv. Sometimes for some reason my belly doesn't get bothered after eating ground decarbed cannabis.
My plan with all my abv is to make a not so quick ISO wash, drive off the ISO, and make some edibles with the resultant oil, mixed into coconut butter. This weekend I had considered doing what you mentioned, glad I didn't. I really think it depends on the individual, though, and I have stomach problems sometimes.
Did you grind the abv in a coffee grinder really well before eating it?
Hope you are feeling better.
Decarboxylation is a function of time and temperature.