Went back today and after talking about which tooth I thought it was (not really sure) and then him doing the cold test which seemed to confirm the one I though. He decided to do the prelim work for a root canal. Unfortunately when he started treatment the drilling caused extreme pain so he had to stop and he gave me more anaesthetic which did stop the nerve sensation. This all took a lot of time so he was unable to complete the root work, so Ive got to go back in the morning for that to be completed and to see if there has been any improvement in pain before him deciding whether the other tooth needs doing. Still hurting quite a bit, so I'm not sure if it's the right tooth. It's just such a nightmare. I couldn't stop shaking!