I had originally posted this on the forum for Manic Depressive disorder, which is my diagnosis. I think that this area may be a better fit (so I'm "crossing over"):
This is nearly impossible to describe, but it's become a problem recently:
Lately I've felt a great distance from myself, as though I'm not entirely here (...my brain is tripping). I don't notice it much until I'm away from home. I live alone apart from ...