I have had my share of doctors and honestly, I have VERY little faith in them. I tend to question them a lot and I don't care if they like it or not. I agree that you need to push for what you want and I have gotten rid of doctors if I don't get what I ask for. To me they are no better than me, and they surely don't know it all. They can be very judgemental just on how you look.

Like jerkKiller said

"Just stay on them, keep insisting on what you want, after all, it's your body, your safety and health you're worried about! Besides, they work for you remember."

You will get what you want eventually.