You certainly HAVE been a fighter! When the dust settles, maybe you could consult with a disability attorney to figure out whether it would make sense to try to do something that doesn't require a lot of physical work and that you could do at your own pace. Sounds like you have a lot of expertise you've developed in elder care. Consulting and writing are two things that might potentially be doable, and there's a lot of demand for content and information on stuff like that as our parents age.
This can be an opportunity to figure out a direction to go. I'm about the same age as you are (61 this summer), and even though I sometimes wish I had more time to do what I want, my job provides some very necessary structure and purpose to my days.