I avoided the dentist for 15 years, all because when I was young (prior to elementary school) I had an abcessed tooth. Our local dentist removed it, and I would wake up with blood all over my pillow and face at night because the wound kept opening up. Then I got sores inside my mouth because he had used unsanitary dental tools. When my mom complained (this was back in the 70s) about the persistent bleeding, he told her not to give me anything to eat or drink for a few days to give it a chance to heal.
Of course she didn't follow that advice, and brought me to an oral surgeon who took one look at my mouth and fixed me up for free (needed 3 stitches in the empty socket and a spacer to leave room for the adult tooth to come years later, as it was a molar).
Anyway . . . .fast forward to my 20s. Needed to go to a dentist and was terrified. At that time, I called 1800 Dentist and asked for the name of a dentist who specializes in fearful patients. They sent me to my current one, and she has been absolutely FABULOUS. Adore her.
I imagine these days you can probably just google a dentist who knows how to deal with fearful patients. Many in this area offer sedation dentistry. Good luck to you, and you can get through it! Maybe bring an ipod, so you can listen to music during the procedure.