I had to have a wisdom tooth that broke taken out last year. I got into such a state about it bacause I hate any dental treatment. It's been the easiest dental thing I've had done. Unlike a filling it is over in what seemed like less than a minute and I didn't have any pain afterwards.
Can you organise a treat for yourself afterwards to focus on. I had to have it extracted on a day dd was at nursery as it was the only day they did extractions, but it was really nice to have it done and over with in the morning and to have a relaxing day to pamper myself afterwards.
Sympathies though, the build up to these things is awful. But IT WILL BE O.K.