I dont know if this is what i have but you all sound just like me. I went to my dentist because my gums felt swollen and i could feel pressure. she suggested i see an endodontist. she gave me pennvk just incase. on thanks giving evening not only did my right side of my upper jaw hurt but my left upper tooth as well. i went to the eno but i could not pin point exactly which tooth it was and he could not find anything either. i went then to another dentist and he though i had sinus infection . long story short i do not have sinus infection but i was told to see an oral surgeon i did and he said there was nothing wrong with my teeth but suggested i get a root canal on the one tooth to make sure. i think that is avery expensive way to go about it . he is calling my doctor on monday to suggest tegratol for pain. i get neck aches as well. I dont know for sure what i have but it sounds like some of you on here.