Sounds like a typical allergic reaction. I get a swollen roof-of-the-mouth when eating bananas and I usually take benadryl (if I happen to eat bananas). I have the same issue - still itchy and still spotty after the dose -- you'll just have to give it a day or two to clear up. Try some benadryl that is non-drowsy -- that should help so that you're not completely out after you take it. Also..............stop eating banana
