I look at a diagnosis not as a label but as a group of symptoms that that name identifies, to give aid in treating that group of symptoms. i.e. if a person is diagnosed with depression, there is a course of treatment and medications that is known to help for that, but if the diagnosis is bipolar, some of the derpression treatments are not the best coarse so something else is recommended.

NOS I think just means that the symptoms don't really fit into one package or another but span many. Therefore instead of forcing treatment into a set good for one or the other I would think a diagnosis of NOS means more focus on the groups of symptoms themselves rather on a pre-established label.

I was in a DBT program and found it quite effective for me. If they are working toward relieving your symptoms keep working on it, maybe you can look for some different/new DBT skills to build on the ones you have, or some other types of skills building on the successful of DBT.

Good luck Leomama