question: I was on augmentin and became very itchy, no hives just very itchy. I went to the ER and they gave me IV Benadryl. Ever since then I have been weary about having an allergic reaction because that same day that I became itchy I also had some shrimp sushi. I have never had any food allergies and 25, but read that a food allergy can just appear at any age. What are the chances of developing a food allergy as an adult?