I have to say that in this kind of situation I would probably see the therapist as just part of the system. I guess I would go to her and share as much as I felt comfortable with and try to be cooperative so that I could get my benefits. But I don't think I would see her as a person there to help me. I would see her more as someone to help the government. That would make me share only as much as I had to. And I wouldn't see the therapist as being likely to help me with my real problems. Or likely to empathize with me, as much as that sucks.

If I really felt like I needed treatment I would find someone else to see for that, and that's where I'd talk about my anger and anxiety about this situation. The situation seems totally unfair, but it also seems like you might not have any other options if you want the benefits.