Thinking about this topic again, because it became relevant. My coping is effective enough that anx/depression is perfectly stable in ruining my life (but not completely, more on that later)
My coping strategy (in rough order of effectiveness)
1. Talk to people, about anything - from a tv show/anime to the weather to technical topics [in the case of people interested in that kind of thing]. For the more athletic among you, sport can work as well, but the only sport I'm any good at is dinghy racing (aka sailing).
2. Exercise (walk 12 miles or so, is a good solitary activity), probably fortunate that my city is safe enough to allow for undirected exploration, again if there are people to walk/hike with, it's about 50% more effective.
3. Escapism (a book, audiobook, tv series, movie, game, webcomic, manga, anime) I still have a lot of stuff acquired from the college sneakernet (swapping hard drives, when broadband internet was still a novelty, and unlimited data didn't exist)
4. Radio, anything live or studio (at least someone talking every now and then), also podcasts.
5. Reading technical articles/newspapers (though they are a bit depressing atm)/ scientific papers/ blogs/ documentaries.
6. Rest, hydration, food (well these stop the downward spiral because in my case depression suppresses appetite)
7. Tons of other tricks that I'll think of later (mindfulness, quiet contemplation, survival instict as a motivator, building resilience during the 'normal times' - even a little is priceless)
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So that's what works in my case, but (here's the problem) it means I devote a lot of time to just maintaining a state of mental heath. It means a lot gets neglected. I can spend month(s) just sitting on the edge of complete psychological collapse, which means I live day-to-day and suddenly a whole quarter of the year vanishes, just like that.
Certainly I keep the rent paid, lights on, and finances in order, I have no addictions or dependency but that's it. It's hit the point where I no longer grasp the concept of 'want' (I have 18mo salary in the bank, because I literally don't want to buy anything, but it's not just material, when I'm "the future" beyond tomorrow is purely hypothetical ).
What this all means is, I will always hold back on the 1%, the non-essential, and by the time I finally figure this life out I'll be too old for any of it to matter (provided my country hasn't been annihilated by blindly following the US into a nuclear war in the meantime).
I don't think I will ever talk to a psychologist about it though because the vulnerability I feel in revealing my inner identity is immense. (In reality i am strongly emotionally affective and empathetic, which makes one a sitting duck in a schoolyard, so I learned to hide this).
The risk is, if I place trust and that trust is betrayed, it would be quite destructive for myself (the situation as a patient is different to that of a friend or acquaintance where trust is gradually built up).
That (as i've come to realise this year) has also helped keep me out of relationships (that is not the topic of this post though).
Now that I typed all this, I'm going to delete it, aw what the heck.