This sounds awful and I am sorry you are struggling SP!

You psychiatrist is obligated to tell you if she thinks therapy is harming you, so in a way what she recommended sounds responsible. I do think she should establish that you have other coping mechanisms in place in before suggesting you drop an important part of your life. I don't understand why you need to prove how sick you are?

I'm interested what your therapist's opinion is. I've read that almost all clients regress as termination looms, so the idea of 'keeping sick' doesn't sound outlandish. In my very unprofessional opinion though, it might be a good plan to keep seeing a therapist as maintenance, even if you are well. That would make being sick irrelevant to holding on to an important relationship. When you truly don't need therapy anymore, leaving will be easier. And how long you see a therapist is your decision alone!