Hi Peter,
Welcome! I am not a psychologist or psychiatrist either. I think that to get correct diagnosis you really need to see either one of these. Finding the right one can be difficult though , as many dont believe in this disorder. What I can tell you from experience though , is that D.I.D comes in various forms. I personally am aware of various "young ones' or "alters" residing inside. I too have trouble recognising myself in the mirror. I feel "apart" from my adult self, especially when triggered by something. However, I funtion pretty normally in my everyday life, but always aware of the thoughts of these others. I think that there is a great misconception that people with D.I.D are completely crazy, which is unfortunate. I am now at the point where I am aware how and when each personality was created, each from a different trauma. The only time my adult self allows them to come out these days, is in the safety of the therapy room. It has taken many years and a lot of work. Dont be scared of these feelings, you can still live a fully functional normal life. Good luck with finding a therapist.