Just a warning for you...
If a child is doubled over in his chair.
Then you find him lying on the floor holding his stomach.
And he refuses your offer to send him to the nurse...
MAKE HIM GO ANYWAY.

Otherwise, he might throw up in your classroom.
And not on the tile floor that is two feet away...
But on your carpet.
Where the stench will remain for the whole day.
And the rest of your students all day long will ask you, "Did someone throw up in here?"
And the stench will randomly reoccur and make you gag...
Until you have to borrow some air freshener to somewhat cover it up.

Just wanted to give you a warning from my experience today.
It was just lovely.