I deal with a chronic illness so I do understand how you feel.
I will say, only share as much as you want to share about your situation, your audience is not entitled to what happens in your personal life. You can mention that you are working at your own pace and you are dealing with stuff that may keep updates slow. I sometime put heads up in my author comments about possible delays.
If you are in a situation where things get really bad, there is nothing wrong with just going silent or "disappearing with no explanation". Because stuff happens and sometimes it's not really other people's business. You can make a post coming back apologizing for your absence. If your readers respect you as a person, then they should not be angry at you.
Don't work to the point where you end up making your health worse, take breaks, and I wish you luck.