K.H.
I would call his doctor.
We have no food allergies in my family, either, until my mom developed them in her fifties. She has recently become allergic to wheat, oats, and barley but loves bread. She cheated a couple of times - just a little bit. The first time, her face got a little red and swollen - her usual reaction. The second time, it made it hard for her to breathe. I wouldn't mess with it until you talk to the doctor.