I went through 4 years on infertility treatment with my last child, which meant procedures and tests a lot more invasive than a PAP smear (and, of course, I had that too). Yep, it was rough. I hadn't really dealt with much of my PTSD stuff at all at that point. Minimal therapy, and I never talked about it, so it was even harder. I did tell my Ob/Gyn after about year, though. I kept miscarrying. (I've had 5 total). I thought it was my fault, because I never sought medical treatment after being raped, and I was sure something was wrong that was affecting my ability to carry a baby to term. He couldn't have been more kind. He sat down, and explained that, no, there wasn't anything structurally wrong, and it had nothing to do with having been raped. I simply had a progesterone deficiency that was causing me to have difficulty, and now that that was understood, he was sure it was treatable. My husband went with me to all the appointments. He knew how hard it was for me. And between a wonderful doctor, my wonderful hubs, and the miracles of modern science, we did, in fact, have a beautiful baby girl. She's 11 now. No child has ever been more cherished.
If I had to do it over again, I would suggest this: Talk to the doc right out of the gate. Tell him enough about your history that he can take the extra time needed, and be patient and stop if you need to. In the US, there is always a nurse in the room. If you can't face telling the doc, talk to her. I would do it BEFORE the appointment, so she can advise the MD. A female MD might be helpful. Take along someone you trust. For me, it was the hubby (I have to go again in the near future - and I'm still going to be taking him along for moral support). A good friend will work nicely too. And if you're in therapy, talk to your therapist about it well before the appointment. I would also suggest getting an early morning appointment, so the doc doesn't have a chance to get behind, leaving you suffering in the waiting room, or at home thinking about it all day. And plan something fun for that day. Lunch with a friend, or a movie. Distraction can be a wonderful thing.
I would suggest that you go, though. I really do know how hard it is, but I personally feel it's also very important.