Nancy,
During your time of mourning, I would like to express my sincere condolence at the loss Mom. Don't be so hard on yourself you just lost your mom it take time to work through your grief and that takes patience.
For some, tears are the best therapy for emotional strain. Weeping is a natural way to ease anguish and release pain.I don"t know if time heals, it may make it easier to deal with your loss however the bible says; Draw close to God in prayer, and he will draw close to you.” (James 4:8) I hope if i ever get sick my daughter will show the same loving kindnesss you showed your mother