Months ago I started getting severe tooth and gumm pain. I went to the dentist and he said there was nothing wrong so it could be allergies. I usually get horrible headaches along with the tooth pain on the side of my head that the tooth pain is on. Laying down makes it worse and it doesn't seem to go away all day unless I take advil. Could it really be an allergic reaction? Has anyone had these kind of symptoms due to allergies? Any help would be appreciated.