Hello~My food allergies usually cause Anxiety attacks. I use to have many food allergies, but now, I hardly have any and the ones I do have really don't cause many symptoms at all. Oh, I do know that food allergies can cause weight gain in certain people, especially if it is wheat. Allergies are hard to detect at times and can be hard to control.
Sometimes allergies are delayed reaction and some can be immediate. It's a good idea to see a doctor to see what you are allergic to and to formulate a game plan. I agree with SassyLassie above, too!
C~