[quicksix]

Many years ago, I worked as an aide in an Alzheimer's unit. Our goal was to enrich the patients lives through activities, trying to keep as much cognitive abilities as possible. I found that the families were the ones that needed help, dealing with the person who replaced Mom.
A facility can keep them safe, dryand fed. As tough as that sounds, it's the truth.
Find a support group, talk to someone who is dealing with the same thing you are, you are not alone, the feelings you are having are normal. Take care of you, you have done the best you can do for your Mom.