Im sorry there is no one way to explain it to a treatment provider so that they will understand. this is because mental disorders affect each person differently there is uniform diagnostic's here in the USA but the problems and symptoms can be infinite... the best way to get your treatment provider to understand what you mean is just be honest and tell them what is happening with you, what you feel your problems/symptoms are.

you are right here in the USA the DSM has changed and with it came many new mental disorders and some mental disorders received a new name and other mental disorders were discontnued as a mental disorder due to those problems being researched, and documented and now more is understood about those problems...

As for DDNOS the USA no longer has a mental disorder called DDNOS. here is where you can read about the dissociative disorders recognized by america in the presently used DSM 5...

http://forums.psychcentral.com/disso...s-dsm-5-a.html

short version with DDNOS many of its symptoms /problems wereadded to the PTSD mental disorder (Post Traumatic Stress Disorder) and the rest of the DDNOS mental disorder was divided up into two new mental disorders called OSDD (other Specified Dissociative Disorder) and UDD (unspecified Dissociative Disorder).

your treatment provider will be able to explain which of these mental disorders (PTSD, OSDD, or UDD) that fits you according to what your own problems/symptoms are. you can also ask for a psychiatric evaluation. this is an indepth testing process that will be able to tell you where you fit in according to the news DSM 5 diagnostic standards.