All NOS means is that you don't fit specifically into the DSM criteria for one of the personality disorder diagnoses. This could be because you don't quite have all the criteria needed, because it's not as severe for all criteria, because you are more of a blend between two or more, etc. The important part is that they form a good psychological profile of YOU, not a diagnosis. It's YOU that needs treatment, not a diagnosis that needs treatment. And sometimes are bodies and minds just don't "cooperate" with existing technology and knowledge, and we don't get to know what's going on. That's frustrating and maybe anxiety provoking, but it's sometimes just what it is.

gg