I have never seen allergies cause pain to this degree. Plus, it's hard to call something 'allergies' when there isn't a huge component of allergic-type symptoms (sneezing, runny nose, watery eyes, itching). How old is your daughter? For young kids, this could be teething pain. She could have bad acid reflux. There could be something else going on too. My advice would be to see a different doctor (any Pediatric ENT specialists in your area?) and get another exam/opinion. Without an obvious cause, this will take some sleuthing and a doc with experience with these types of problems.