Why was it clear to her that clinically you needed a different therapist if only the week before she said you were making progress?! She isn't making any sense and owes you an explanation.

I am sorry for her totally unprofessional behaviour and the pain this is causing.

No, you were not too much for her. Clearly, she was not enough for you. As for doing wrong - she did. IF a client does something wrong, a proficient T starts a discussion with the client. She is the one who did wrong by terminating you out of the blue.