Hey
@OCTOPUS, sorry to hear you're having a scare, I'll keep my fingers crossed for you!
I have been (and still am) where you are - became ill at 25, diagnosed at 26, and had to give up work (for an employer) at 27, so I'm 5 years deep in solely online self-employment now (plus sickness benefits from the gov... what little there is, because I can't even work many hours any more), and it IS hard, but manageable. You're in a better position than I was with actually having insurance, I hope you'll be able to make use of it if needs be.
Crisp isn't what it was, but I'm still with them, and Appen is an option too if you can get on a decent project. As
@EdibleDormouse mentioned, DataAnnotation seems like it could be a good earner, if you can get on (I have writing/editing/creative experience, and wrote what I thought was a pretty good story for the test, but no luck for me). uTest doesn't come up much here any more, but they still have regular projects, if website/app testing is something you're interested in. Prolific and Intellizoom help as well, and being at home on the laptop more gives you a better chance of seeing and catching the better paid studies. If you have any skills you could offer on sites like PeoplePerHour and Upwork, they're worth a look too, even if it can be a bit of a race to the bottom, I have found some long-term clients through there - you can find diamonds if you wade through the shit enough.
Being poorly and having this sort of work worry hanging over you is really naff - feel free to drop me a DM any time if you want to chat with someone who knows what you're going through. Best of luck, you've got this!