Yes I know, a MIL one. Sorry. 
I am having an ELCS tomorrow as baby is breech. DH told his mum last week. I also have M.E. and after DS's (natural) birth, I felt really awful and pressured into having visitors when I wasn't completely up to it.
I said to DH that this time will be different. He texted his mum today to tell her that we won't be having any visitors tomorrow, given that I am having major surgery and we are going to be very tired etc.
Her reply was "well you won't be getting any visitors at all then" 
I'm sorry but I found this completely ridiculous. Everyone else I know have said "when you are up to it, let us know" etc etc, but not MIL. DH said she probably has the hump now.
So, AIBU to think that she should understand I don't want anyone (except possibly my GPs who brought me up and they are having DS who I want to see as soon as I am up to it, MIL doesn't actually know this though) there, on the day of surgery, seeing me like that, catheter in, trying to breast feed?