I am hopeful that this is not an old thread because what you typed is my condition exactly! Same feelings, same situation. I don't want to go on and on but mine began last spring and it's been relentless 2 root canals later and I am in worse shape then before I had them. I have had very good doctors who were slow to do any work but my pain kept bringing me back to them which ultimately lead to two root canals one next to the other.

I met an oral surgeon and he suggested it might have a micro crack in it. Maybe that's been my problem the whole time? The only way to know is to have the tooth out and I am holding on as long as I can. Your not alone!!