I agree with everyone here. That was way out of line and completely uncalled for. Its one thing to give someone a heads up and ask their permission. Totally something different to have someone there who seems to think that by reading your file they know everything about you! You're more than your file. And I don't even know if it was legal for them to read your file without your permission. You have every right to be pissed off. I think it would be good to write your T a letter if you can.
I also would have a hard time going back to her b/c she has totally broken your trust.
We are here if you need us. And you are doing very well staying strong. Hang in there. Sending you safe and gentle hugs.