OP, depression and anxiety are very serious issues that many ignore. [snip] It's made a huge difference for me as I went years with undiagnosed depression and anxiety that impacted every faucet of my life.
I'd be really annoyed if every faucet I used just merely went "meh" and gave me a dribble of water because it couldn't be bothered.....
Seriously though I've also suffered (still am) and feel games are good therapy, as long as the you avoid those who will just feed on that depression like a meth head.
I think the advice of joining a smaller PG with active interaction rather than a larger one where players are just there to get away from the idiots is good - If there isn't one, you could always make one, going by many threads seems there's lots of players who would like some more player interaction, who don't necessarily want to be tied to doing BGS stuff.
You could maybe make one that concentrates in a section of the bubble and people could come and go but be more likely to meet or co-operate with other players. A sort of "Sector X PG". Once you've got a few members you can make a FB page and organise events or notify of ongoing activites..... you prolly might not even have to do all that yourself, there's usually people around good at that sort of thing in most games.
Only things I would stipulate are
no PvP and if they leave that area of space they MUST leave the group but they are free to rejoin if they return.
(might even help space to feel more occupied.)
No idea if you can join multiple PG's - but it's a thought?