3 off is fab! Well done
Good luck with dentist. Am sure you'll be fine!
When I had my root canal I had a lot of pain develop in the tooth - couldn't even put my teeth together as the tooth got so sensitive. Did have an infection and antibiotics before the root canal. Then after it was done it took a good few weeks for the pain (that I'd had pre root canal, not caused by root canal) to go away completely. Healing time. Didn't need any pain killers or anything during that time though. My tooth over the couple of years after did go a bit black, and then at Easter last year it broke whilst I was eating a piece of pork crackling with Sunday roast! My dentist managed to build it up with white filling, which looks really good, and better than before as not black anymore
Eventually I will probably need a crown on it, but for now, it's good