Some people have a hard time accepting the dx of DID. I think it is because they dont want to know that we all have parts of our selves and that it could happen. I think the fact that childabuse can be so bad that someone splits into parts it freaks them out. Especially mental health workers in group homes. i dont think alot of them know what they are doing with DID and i think it can make a person worse by being there, unless of course they find someone who they can talk to and feel comfortable with. May be it would be better if you were able to just talk to your T about the self harming issue that others want to do . may be you can just call crisis or something that understands.
Good luck.