What does your therapist say about it? Before you decide anything, maybe you could ask your therapist and your doctor to talk to each other and see what they agree on, and/or arrange a meeting with you and both of them to decide where to go from this point. Most of the DBT groups that I have heard of are to supplement individual therapy, not replace it, and the skills are really good, but your therapist would need to back up the DBT skills and work as a team with the group therapist and your doctor. Any time you have more than one professional on your team, they need to communicate with each other so that they ensure they are working together and not against each other.

It sounds like you have come a long way. It's hard to accept that your anger is justifyable and acceptable, and that you are allowed to be angry. Feeling responsible for what is done to you seems to go along with the territory and may serve a purpose for you, although I am sure you would not hold another child to blame if those things were done to them, right?

Letting go of someone who has supported and helped you, and has been a person you can trust, might be the hardest part of therapy. Although I have left or been terminated by several therapists, I never quite had that kind of relationship with them. One of them was hard to let go of. I can't imagine letting go of the therapist I have now though (couldn't with the last one either though, and I got through that once he was replaced). I am told that when you are ready to leave therapy it won't be as hard, but I think some might have a different take on that too.

I hope this helps you.

Rap