I'm sorry it was so traumatizing. I've had similar experiences (especially with dbt). I wasn't able to read all of your post, sorry... do you have a therapist outside of the program for support in the "down" time?
Would you be open to a trauma-specific program? When none of the other programs or treatments I tried had worked, the trauma-specific program was miles above (I only wish insurance hadn't kicked me out when they did)...
I'm sorry treatment has been so rough...