Exactly this! Litterally could not have said it better myself. My biggest fear is losing contact with others, especially my loved ones. Being unable to articulate myself properly and nobody who can really relate because of delusions sounds like a true nightmare. I already feel pretty damn lonely having dpdr so I cant even imagine what a person going trough psychosis must feel like and its so damn frightening.
By the way, that makes me remember something. I remember once, I felt very lonely. Maybe it was soon after I had gotten a diagnosis of schizoaffective disorder, some years ago (that never got confirmed later, I think it was BS), and had started my first anti-psychotic treatment + lithium. I felt a very deep loneliness for some days, that was maybe related to the fear of becoming crazy after that diagnosis, but maybe related also to the onset of the treatment, I had some DP episode for two weeks (and then not anymore for the two years of treatment). Anyway, it might all be related. And at some point I sat down and started to write a kind of poem about what I felt, and a kind of feeling of nostalgia and craziness, that was kind of impossible to explain. I didn't worry about the style of what I wrote, I wrote it just for myself, but I tried to use it to express what I thought was impossible to express with words, but I tried to be as natural as possible, really with my own style (it was a kind of mixture between a short story and a poem). As soon as I had finished it, and I read it and found that, for me, it really expressed how I was feeling as well as that feeling of loneliness, and that loneliness instantly evaporated, and I haven't felt it like this until now (maybe 3 years). I have never shown this text to anyone and didn't feel the need to (and my computer got stolen since then, so I have lost it), but just as I read it, I felt that it was indeed possible to express how I felt, I just really thought that someone reading this would understand, and maybe that did the trick.
edit: perhaps we should have a section of the forum for sharing poems, like teenagers did on their blogs in the 2000's, with awful yellow calligraphic fonts and pixelized gifs of women with their hair moving in the wind. And dolphins.