Allergies

My son has an allergy to peanuts. We figured this out a few months ago after eating 1/2 a peanut butter cookie and then have a reaction to it a couple of hours later. He doesn't like peanuts or peanut butter, so avoiding them for him is not hard. Except for the fact that tons of stuff have peanuts, peanut oil, or have been processed in plants with peanuts. I bought some mint chocolate chip ice cream never thinking I needed to worry about it. You guessed it, made with peanut oil. Oh and if I have a craving for a candy bar. Do you think I can find one without peanuts (b/c we aren't even supposed to have that stuff in the house)? No except for maybe plain hershey's chocolate. Three muskateers, kit kats were two that should not have peanuts in them or even the possibility of a peanut but they do. Frustrating.
Anyway, that is not the point of this story. Yesterday, as far as we can tell, Son had nothing at all even remotely close to eating peanuts of any kind except maybe a few Junior mints in the early afternoon. But I am pretty sure I checked the label. Last night about 10 he woke up coughing, running nose, feeling like he was going to throw up, and had bloodshot eyes. The same reaction he had after eating the cookie. He even said he needed medicine like when he ate the peanut butter cookie. So he obviously felt the same. We have no idea what could have triggered it. It was hours after eating. Fortunately, Benadryl stopped it from progressing. But it is scary. Scary that he has this allergy and it can hit him when we aren't even sure why. Now we are starting a journal for when he has these reactions. To see if there is a common theme. Hopefully, he won't have anymore. But we will keep his Benadryl and EpiPen close by just in case.