Hey, kneehole. I hope you will be able to tell your T about your anger when you meet with her next time. Maybe the two of you can get at the root of your anger, and you can start to deal with your passivity. She might have sort of surprised you, though, with what she did. That kind of thing has happened to me a lot, and as you say, only later do I realize how mad I am about it.
I happen to believe in prayer. But I think human treatment of disorders is important in most cases. Are you telling your T about the self-harm and are you two working on ways to help you to be able to stop?