Oh Maggie,
I am so sorry to hear of what you are going through. My heart goes out to you and your family. I have been in the care-giver role for a while now, myself, although not to the same extent of intensity as your situation sounds to be.
Praise God that your folks are believers. I cannot imagine trying to get through the trials of this life without the blessed hope of something better to come.
In my situation, my sister and I recently did some research and discovered many wonderful local resources for elder care, senior independence and care-giver respite. Just last week did a worker come to my folks' home to install safety bars in the bathroom and other strategic locations in their home, all at no cost. The same organization that provided that service also has resources available for care-givers. Another local organization provided a free bedside commode after my mom fell a couple of times in the bathroom. It's something to think about and maybe look into. We would have never known about these resources without a little searching.
I'm praying for you and your family.
Snoopy