I can understand feeling so alone! One thing I hate about having alters (although I'm not diagnosed with DID, just DDNOS), is that no one understands. I've tried to tell people in my life and some of them are genuinely interested so that they can support me. However I make a point not to go to them for dissociative issues because I'm afraid of losing them. Everyone else who knows I often wish I could take back the information. I used to have a process, when I misdiagnosed with other things, such as bipolar: I would get to know someone, make sure they had a positive opinion of me as a capable person, and then I would tell them. The problem was, when I was having issues, I wouldn't tell anyone but my treatment providers and any mentors I had, for fear of being refected.
I don't know how real, or unreal that fear is, but I definitely would rather someone leave me because I'm hard to get to know, than because I'm fragile and they can't deal.
Slowly over time you will find the right people and the right supports. You will find yourself more able to support YOU, and this will help. Just like it takes time to 'fit in' to a new town you move to, it takes time to adapt to the new diagnosis.
We're here for you, though, so hopefully you will be a regular visitor during your journey
xo
IJ