I am so very sorry to hear of your loss. My heart goes out to you. I lost my mother to a sudden pulmonary embolism, a few days after a car accident. She was 72 years young.
I miss her so very much, and not a day goes by that I don't think of her. She passed three years ago.
Take care of yourself, allow yourself all the time you need to grieve. The loss of a close family member is painful. Talk out your feelings to everyone who will listen, share your grief, and don't listen to anyone who tells you to get over it or put up a strong front.
The love you and your mother shared will never die, it will always be in your heart.
My deepest sympathies...