I don't think I could live with being subjected to ridicule or disgust by others here.
That isn't going to happen, we all know the pain you feel, we feel it as well. This site is for Survivors - by Survivors.
From reading your post I get the feeling that dealing with your abuse is fairly new to you, and that's the scary time. I first disclosed my abuse at the age of 46, about 6 years ago. And I can remember the feelings of terror, shame, guilt and uncertainty that I went through. They do get better Marc, it's not easy and you will have to work at it, but it will get better.
You've done the hardest thing already - making an appointment to see the psychiatrist. And you seem to have made a good choice in finding one that knows about PTSD and abuse.
Walking through his door for the first time will be hard, but walking out will be wonderful. Proper professional treatment is the way to go without a doubt.
It's also going to be difficult to relate what happened to you to your therapist, but trust me on this one, he's heard it before and you ain't going to shock him. And if you don't tell, he won't be able to help.
Releasing the crap that happened to you helps one person - "YOU" .
The secrets are shattered and you regain control.
the same thing happens here Marc, we know what goes on behind closed doors, we know the ways and lies of the abusers. So ask your questions, please don't think you will be judged or ridiculed - it won't happen. We might not have any answers, if we did have some we wouldn't need to be here ! but what we have is understanding and support, and you're welcome to your share of it.