Getting sick is no fun; even worse is interrupting much needed sleep to readjust the next day's schedule when you take a sick day.

Enter "Out Sick", which takes care of all that for you so you can get your rest.

When run, this shortcut looks at your specified calendars for the current day and:

Emails all attendees of meetings you've scheduled and lets them know you'll need to reschedule. Emails all of the meeting owners whose meetings you've accepted and lets them know you can't make it (bonus: each owner gets a single email from you, regardless of how many meetings they have on your calendar). Adds a reminder to Reminders for the next day, reminding you to get back to all the missed meetings (a list of which are included in the reminder itself).

You need rest when you're sick; let "Out Sick" do the notifying for you.

UPDATE (2018-10-30): Today's Shortcuts 2.1 release includes an action to toggle an alarm off, which would be a great addition to this shortcut. However, this action appears to not handle user-specified alarms gracefully. More research is being done.