What does your t say about her leaving? Are you going to keep seeing (over the next 6 months) the pdoc that is taking over for your t? It might help with the transition if you do.
I know it's little consolation but I want to remind you that part of therapy for most of us entails creating a good ending... most of us haven't experienced that before. I know for me, it's very difficult to think of. I don't want to be without my t... ever... but I know that part of her job is to teach me how to/ know when to end something.
Keep writing and talking
-CT