Ive always honestly just googled “therapist” or “psychiatrist” in whatever area i live in and go from the search suggestions. Someone please correct me if im wrong, but I believe if you want to be diagnosed your best bet is a psychologist or psychiatrist. I think a therapist is just well, therapy. (Although i think a licensed clinical social worker can diagnose you too). A psychologist can diagnose you and provide therapy but CANNOT prescribe medication. A psychiatrist CAN prescribe medication, diagnose you, and give you therapy. To answer your second question, I honestly dont know. I think it depends on who you see. Everyone does things differently. It would be a good idea to ask them that question when you find someone.