Michael,
Sorry for the loss of your mom, I know it has to be tough, but hang in there, she would want you to be strong. I was raised by my grandparents and I can tell you the day Pop died I felt like someone ripped my heart out. Mom followed within a year, they were married 65 years and had a good life together. Never had any family member to be close to, mother was divorced either at work or on a date, dad was not around, met him when I was 13, he threatened to kill me at 16 so I never saw him again till he died 6 years later. Be thankful of the good time and close relationship you shared and think of the good times you spent together.
We will say a prayer for your mom. You have tons of good memories, focus on them and she will still make you smile.