It may not feel like it now but you are doing the best you can and that is enough! You are honoring your mother for caring as much as you do. I once heard a pastor say that there must be so many hearing aids, hip replacements, old joints, etc at the gates of heaven. I took care of my grandfather for over a year, and when he was close to passing, he was having trouble letting go. Before he passed I told him everything he worked so hard would be taken care and that we would take care of grandmother. It was incredibly hard and something I wish no one ever had experienced. My one solace was that at the gates I knew he lost his closed up throat, his dementia, his arthritis and got a new body with no more pain. There is no shame in feeling relief for them!