((((((((((((Omers))))))))))))))) So so sorry for your pain. We go to therapy to heal, not to get hurt. I know you said not to blame your former T, but did you ever talk to the people that trained her? That could be traumatic for someone else she might see.
Anyway, I think it's great you have a new, supportive massage T. Is it possible that massage T is triggering that reaction by the way she massages you? Just a guess. I think definitely talk to massage T when you are ready, she would want to know. From what you say she would definitely not want to trigger that so tell her when you are ready. Sending good thoughts your way!