The magic words if you need time off work is that you have an illness that is cognitive in nature and is affecting your ability to perform your job. Then the doctor writes a note to this effect.

I totally feel for folks that need time off but can't get it. I need time off too but right now I need the money. I have a few days sick leave and some vacation, which I am hoarding in case I "really" need it ... I think I might need it ... doesn't matter how much I have used to date...