Young Lady. I just read your storey & believe me I can see your pain and stress you have put your self though, But if you don't stop you will be the one who is going to need help. I am very very sorry about your Mother and the hell she has been though, but take a step back and ask yourself is it what your Mother really want to have all that treatment or is it only you how wants her to have it.
Let your Mother go just be by her side and hold her hand to show her to love her.