My sympathies for your loss and the neglect that led to your mothers death. Having lost my mother and sister I know that there is nothing that can be said to make you feel better right now, its all just too painful to process, but just know that there are wonderful people on this forum with a wealth of experience and a willingness to share that experience or just listen.
Right now, be kind to yourself and as hard as it is, please try and take care of yourself, your mother would never have wanted your health to suffer because of what happened to her.
My prayers go out to you and your family.
Ceelions