Kind of random, but this reminded me of Joe’s Apartment - it’s a movie.
It’s a comedy & Joe doesn’t have a mental illness, but maybe if you watch it, it’ll add some humor to the situation, in your mind if nowhere else.
I second the idea of a pet. We have lots of animals.
Cats are probably the easiest to take care of. Dogs probably take the most effort.
Caring for the local stray is a great idea because he wouldn’t have to bother with the litter box. That’s really the only thing about a cat that takes much effort.
Our latest project is fish - lots to learn there, but we’re figuring it all out on small tank & have only had one casualty so far.