I have phobias of both doctors and dentists and have been treated poorly by both.
It's because you feel very vulnerable at their offices. You're sick, that's why you're there, and you're trusting them not to harm you. But you have to try to tell yourself that you're the one in control, not them. They might nag you or tell you to stop complaining or pressure you, but they need your money to make a living. And they can't force you to do anything you don't want to.
It's hard, but if a dentist says not to complain or to suck things up or whatever, you should confront them about it and leave. I've actually done this a few times, although it's really difficult and the mean doctors will go out of their way to continue to confront you back as you leave and ban you from their office.
But you have to believe that you deserve good treatment and you have to believe in standing up for yourself. I don't know about you, but I was abused as a child, so I tend to be terrified and feel little in these kinds of situations.
But you're an adult and you're the one with the money. Their job is to convince you that they're good enough to take care of your teeth, not the other way around.
And I guarantee you that those people are losing patients all the time. I had to get rid of a doctor who mistreated me when I got violently ill from the medication he gave me (he was angry at me because of something my body did that I can't control.) I told him that he had no right to speak to me that way and I left and it's really no surprise that this doctor is losing his practice now because he can't get enough patients. I was wondering at the time why his office was always so empty.
Anyway, I also did the same thing with my current dentist. I was nervous about a procedure and I wanted to ask questions beforehand. They said I wasn't allowed to ask questions, so I got up and said,"Well, then I'm done. I'm not getting a procedure if I'm not allowed to ask questions about it."
So they found a way to make time for my questions and if they hadn't, then that would have been the last day I ever saw them.
I also left a dentists office when I told him I was afraid of getting dental work and he told me he couldn't work on me if I insisted on not trying at all. (Because being afraid to him was the same as me being lazy.) And he was not the last dentist I saw. I was able to move on and I'm glad he has no say in my teeth.
This is kind of a lecture I'm giving myself as well as you while I type it. I'm so terrified and I always feel sick to my stomach whenever I confront dentists. But good ones will treat you right.