During my wifes pregnancy, she began having hives constantly after eating anything. She had never really had allergies before, but it turns out when you get pregnant, your DNA is altered. So we got the allergy test done and it came back that she was allergic to like 600 things. So I asked Google what do (I picked 3 things off that list) have in common chemically. Quercetin. So then I looked up Quercetin to see what all that's in. It's in like 600 things. But the doctors are like naw that can't be it, as if the facts aren't staring them in the face. So to answer your question, #@%& yeah you can have a reaction to Quercetin, and i feel for you.
Also, pineapple has quercetin in it.