Oh UM you sound so frustrated. When I started my therapy, my first one left. (unknown why). My second therapist went back to college far away. My third therapist took a new job in another city. But I did not actually get very far into therapy with any of them. I am now on my forth therapist.
Have you considered that the switch may be a blessing in disguise? You dont want a doc who is not going to be there for you!
As long as you are moving forward and not backward it is progress. Please dont give up on yourself. You deserve the best care. Throw aside "care" that is not helping you.