Mod found the post, someone deleted their comment which I had replied to, thankfully the comment was saved, reposting.
It’s not much different than if you have a sudden health problem, any host can become ill or have a family member need attention that requires shutting down hosting. This is not elective surgery. While waiting for a scheduled operation, things can arise that mean you aren’t available.
You need to decide how much stress blocking off dates vs keepinng them open and then needing to cancel will cause you and make the decision.
I have a chronic health problem, I’m hoping for treatment. I don’t know when it will happen, or how it will affect my being able to host. I can’t put everything on hold in case. I will take bookings and if my supports are not enough to make hosting while I’m out of action, then so be it.
You might consider looking for someone to help short term.
If you do have to cancel don’t get into details re waiting list, planned surgery etc. all they need is a doctors note saying you are unfit for x period of time, starting date y. If you give them more info some under-paid, under-qualified customer service agent is liable to cause you undeserved grief.