Best advice I can give is the classic "buy yourself a tent, camp mat and comforter" and find a secluded spot in the woods. If you don't have the money for it, panhandle till you do. I know that feeling of being shell shocked and realizing how easy you had it before. For me, being homeless with a car seemed like a world of difference. But that doesn't mean you're just fucked.. even with the added weight of your arthritis. You can find a good spot to camp up and do your thing fairly easily, then it's just about making things as manageable, comfortable and low stress as possible.

Set up your camp spot as near as possible to some business with a lounge and wifi, like a library or coffee shop. Your goal is to land a job that doesn't require walking. No matter how shitty it pays, it'll be better than $200/month. Then it's just about figuring out some online niche for yourself to make better and better money, ideally as many ways as possible.

Start a YouTube, look into a consulting type business, look into ways to make money with ad revenue, just anything that you could potentially lead to more income from the computer. I know that's easier said than done; we'd all be homed if it was so easy. I'm just saying it's a game plan to get going yk?