You've gotten some great advice about the legal issues pertaining to this breach not only of your confidentiality but also your trust and I think contacting the advocacy groups in your area is a good idea. You might also consider setting up a meeting with your T to confront him or her, find out why they did this, and let them know how you feel. Incidents like this really take away our sense of control and destroy trust -- being able to let them know how you felt about it, and set the boundaries for the future can really help you to get back some of that sense of control.

I am sorry this happened to you and I hope you can get it resolved so you can continue to resolve issues which have caused you pain.