Hi Hannah1234,
I hear your woes about the dentist. I've had alot of problems in the last year especially. Dr. S told me a few weeks ago that having dental problems is part of rsd because blood flow is not getting up into your head...thus that is why we have so much mouth pain and dental problems (great). I find the day before the dentist I take a small dose of antibiotic for only three days or so and right after coming home from there I immediately put an ice pack that has cloth around it in all areas of my mouth and take a Tylenol. It seems to reduce the pain in my mouth. I still have pain for a few weeks (even with just a cleaning) but at least the pain is not as severe as it used to be. Good luck with the dentist. I think trying (I know it is tough) to keep positive before, during, and after the appt is helpful too. Look at it as you are improving your health.
Take care,
kathy d