Your doctor at least has to know your diagnoses, but he shouldn't badger or threaten you to open up. He's going to have to be patient. Maybe you could just ask your T to talk to him.

My trust issues are like yours. I have very very hard time opening up to caregivers because I've been disappointed and abused by them in the past.

Currently I'm getting kicked to the curb by the community health program where I've been seeing my T. There's a rule as to how many visits a person can have with a T. So, after going through hell and back with him, they're telling me it's over. They think I can just jump into another service. I won't go to another service because I don't want to go through that same hell with someone new and with someone I don't know or trust. Not going to happen.