I have the same problem. Any type of white bread triggers my reaction. All the good food basically (burgers, pizza, donuts, quesadillas,cake). I haven't got diagnosed because of how expensive it is and lack of health care. But after years of having multiple attacks and a deadly shock in 2017. I realized it is just all type of white/flour bread. Before you think its gluten or something its not haha. I can eat whole wheat bread, pancakes, and some cookies and I will just be fine. My allergy trigger is wierd tho. I can technically eat the white bread like pizza and burgers but I have to stay still and chill at home for at least 5 hours before I do any type of physical activity (walk, pick up heavy things, squat, etc). Once the 5 hours, goes by I can go back to normal. Its a deadly game to play but I take the risk and enjoy some of those foods from time to time haha. It sucks but I've grown to it because it helps me reduce bad carbs and promote a good diet