Hi Flo,
Have you discussed your anxiety with your dentist? I used to feel the same way, but after I told my dentist that I suffered from extreme anxiety, she worked with me to help control it during my appointments. Things like making sure there was very little pain, talking me through the procedures she would be doing, and providing headphones to listen to music while I was in the chair, all helped a lot. Also, we had a signal that I could give her while she was working on me so that if my anxiety was rising, she would stop and let me take a few deep breaths to relax myself, before she continued. Dentists are very familiar with patient anxiety (LOL) and the good ones will be very willing help you with this. Good Luck!