The title of your piece gut punched me as I sit near my 92 year old mom watching TV with the volume on 65. Nearly blind, profoundly deaf and wracked with pain, she really wants to join my dad and doesn't understand why she's here. Your mother's suffering sounds horrific. No one should go through that or have to witness it.
I've told my mom she could take her daily pain pills all at once to end the torture but she's too Catholic for that. If it were me, i wouldnt even wait for a glass of water.