Working with chronic health issues

In fall, I stepped back from working at a spa. There were many reasons, but the biggest is that my health has taken a turn. I'm using my time working for myself to go to doctors appointments. Unfortunately, the income isn't the best, so I will likely need to start working at a place soon.

Without going into detail, my mystery ailment causes inflammation and swelling that can be disfiguring. My recovery seems to take longer and I'm a lot more tired. I wanted to ask how other therapists worked at a place with chronic/ autoimmune conditions? And how you talk to potential employers about it? How many days do you work at a place?