Shannon mackay

Hi, I've had celiac disease for a year in a half now and I got a new symptom which is the dermatitis herpetaformis rash. When I got contaminated once from gluten I was really sick and had a seizure so I know you get the rash from gluten but is it possible I got it from eating too much corn since it has similar proteins as gluten?? I also can't do Dairy or...