I'm so so sorry to her about your mother. My deepest sympathys go out to you and your family. Just a week ago was 7 years since I lost my mother so I can completely understand how you are feeling. I lost my mother to cancer, and I was mad for a long time. I wasted so much time and energy being mad, I hope you don't do the same thing.
Remember all the good times you had with her, and cherish her memory.
Again, my deepest sympathies,
mia