I had a problem like this when i worked for the NHS. My boss was lovely most of the time but if children got in the way then she was a nightmare.
One morning I was cleaning vomit off my sons wall and even had to throw his mattress out, poor lad had been so ill. I phoned and left a message on her answerphone and she phoned me back asking when i would be back, hopefully later on that day. I was incensed by this and told her that i would be back when he was well enough to go to school, she deducted 2 days from my annual leave!!! She said my parents should have had him or a childminder, now my parents are both pensioners who (as much as they love him, dont want a sick grandson to contend with) and i doubt very much i would have found a childminder who would look after a child with sickness and diarrhoea....
You have my sympathies, its an awful thing to deal with. I consequently left the NHS and became a self employed gardener, best move i ever made!!!