I am sorry to read your therapist is not sufficiently trained in this area, it sounds like you need someone experienced in trauma, they are out there just hope you can find the right one.

As for me dealing with it well, I am not sure about that. I shut myself off and go into my own world a bit. That is exactly how I dealt with bullying when I was younger, it was all I knew to do, not sure it is the right or healthy way.