I feel sick. I can't sleep.
What do I do?
It's happened to all of us. So here is my suggestion.
You are awake anyway so quickly send me (Diana) and email with a quick outline of what is to be done in your class/es.
Then text everyone you can on the sub list telling them you are sick and that they are to contact me (not you) as soon as they can if they are interested in picking up the offered work. Also explain that I will give them your notes.
This gives you the piece of mind that you did everything you could, allowing you to perhaps get some sleep and get better. It sets up a bit of competition amongst subs to get their act together and contact me, and if all else fails, I have the notes for the day and can continue accordingly with at least an idea of where to pick up.