Seconding this. The advice I've always heard is that if you quit a job in under a year, it's a red flag. Generally you get one freebie where people will understand if you had to quit because of a bad fit or a toxic situation or whatever - though you'll probably have to talk about that in your interview - but if there's a pattern of it happening over time, that's a huge red flag.

If I were you I'd try and get one solid year of a job on my resume, to start with. You said you're worried about becoming homeless anyway- why would you quit a $15/hour job if you don't have anything else lined up? Unless it's just a really toxic/destructive situation, that seems like a mistake. Paying the bills for the time being and building up some solid work experience seem like aligned goals right now. The healthcare thing is unfortunate (it's unfortunate that anybody in our society has to be in that position), but I don't think quitting without another offer is going to help.

Best of luck.