Lets see.....
My sick leave balance is around 170 days.
Absolutely no shortage of sympathetic Doctors out there.
Talk to your collegues........
"Whats the nature of your sickness ?", goes something like this-
"I'm not sure as I'm not a doctor but after seeing one you will be the first to know."
Don't bother calling back.
My Doctor refuses to put the nature of my illness on certificates prefering just to write, "illness".
He enjoys telling Qantas clerks who call him to ask, "piss off, it's none of your business".