PLEASE don't back out of this appointment. you may have seena thread recently where i posted about my own health problems which could have been so so much worse had i not had regular smear tests.
Phone and inform the practice manager of your history and ask to be seen by a female Dr or Nurse. explain that you don't necessarily wish to discuss it but you are concerned about any pain or flashbacks.
I assure that although uncomfortable they really aren't painfull....i know you have had some injuries to your crevix but thankfully there are very few nerves in that area so you shouldn't feel any pain frm teh swab being taken.
If you can ask a freind to go with yuo that would be a very good idea. it may be very traumatic for you once its all over and i doubt you will feel like driving.
It will be a rough day but you do need to keep this appointment, don't allow this man to cause you any more pain.
You are an incredibly strong woman - just look how you have coped with your last ordeal - you can do this!