I know this post is old but I thought I would respond. I told my boss what's going on and her response was "it's only work" and that health comes first. I didn't have to mention laws or leaves or anything like that.
She also was very sympathetic and reminded me that, as an exempt employee (salaried), if I work even an hour a day it counts as a day worked and I don't need to use sick time.
There were many times I went above and beyond at work and put in some long hours and finished projects early. I'm REALLY happy that is recognized and now that I need some time it's not going to be a big issue