My concern about "heavy sedation" is that it could make you feel like you are not in control of the situation which would make it even scarier. I'm not saying it is a bad idea, but definitely talk it over with your doctors/therapist.
My other thought is that you could request a "no touching" appt with the GYN first. You could meet in his or her office instead of an examining room and get a sense of whether this is a compassionate doc and get some preliminary questions answered.
Good luck. It sounds like a difficult spot to be in.
EJ