I have been reading some of these post n I'm glad to see im not imagine things . I had a root Canal done in this tooth but was not finished they put a temp n I never went back . After a while tooth cracked n I had to have tooth extraction on a wed. despite I had the root canal it is evident that the nerve is dead but even before I went for extraction I always felt sensitive to hot n cold. Anyway tooth was extracted n I went home n when novacaine wore off I was in pain the whole night called dr he put me on penicillin on Thursday. Since t the extraction my symptoms are pain back of my upper neck ,eat, Temple, eye socket n my glans are swollen. I also have heart palpitations n chest pain , very tired , sweats n very clammy, dizzy ness. I just feel ill went back to dentist n he thought it was dry socket n it wasnt. He said I should go to my family dr . What can it be ?!!!!#