I have brain trauma, so I probably have anywhere between 1 and 3 of "off-days" on any given week, and frequent headaches. Luckily, the way I deal with it is by

I have brain trauma, so I probably have anywhere between 1 and 3 of "off-days" on any given week, and frequent headaches. Luckily, the way I deal with it is by being overly-productive on the good days. So if anyone requests anything on my off-day, I just try to do 1 or 2 things, and for the rest I tell people I will get back to them with more info or will set a future meeting. So far so good. Being 100% remote helps.