(((((( OB ))))))
i don't have much advice, but i do know exactly how it feels. i'm bipolar, but mostly just depressed a lot. funnily enough, i tend to get very depressed exactly when everything is going fine in my world, with no real complaints. for me it's existential and it just happens. it has all my life, on and off. (i do not believe in god, but on my darkest days i wish i could!)
it sounds like being away from your friends and in a less-than-optimal living and work arrangement are definitely not helping your situation - anyone would find that difficult but especially those of us prone to depression. that's a tough gig.
maybe talking to a therapist wouldn't be the worst idea.. you don't have to know what to say.. you feel really bad, that's enough
all i really can say is just try to remember that this won't last forever. it never does. when i'm at my worst, this helps me ride it out.
i really wish you all the best, i hope it looks up soon.
ae