I just stumbled across this scheduling calendar specifically tailored to the caregiver! It is designed so that friends and other caregivers can sign up for different tasks like making meals, appointments, companionship. The best part about it is the service reminds those that sign up when they have scheduled to do something so you don't need to worry about it.
Here is the link to it! http://www.lotsahelpinghands.com/ I hope it helps. We all need a break and this tool can certainly help! Let me know your thoughts on the service once you try it out.