My husband has had three episodes like this now. The last time he went to the ER and was diagnosed with an allergic reaction and given IV Benadryl. His symptoms were: itchy hands, severe sweating, diarrhea, shaking, confusion, tingling all over, whole body turning bright red, and swelling in his feet. This last episode, I helped him get Advil and Benadryl and he recovered in a couple hours. Ideas? Anything to check?