I am also petrified of the dentist, so petrified in fact that I don't even go for 6 monthly check ups - but I take very good care of my teeth and thankfully they have been fine for years.....
When I was 21 I was 'butchered' by a dentist who literally cut two front teeth out of my gums in the chair and without anesthetic, I was covered in blood, I looked like something out of a horror film.....I braved another dentist who repaired the damage and put in 2 crowns, these have lasted for years without problems, but I am so frightened now that I will not go near a dentist.
But as you are having an anesthestic I sure it will be pain free for you and you will be alright, just relax and put it at the back of your mind, October is a long way off yet. Good luck to you. X