First, please accept my most sincere condolences on the loss of your mom. It must be very hard on you right now but please know its very normal to grieve. Reallize that there are stages of grief, some denial, some anger and some depression and some guilt to name a few. It will take time to sort out all your emotions but thats ok. Take all the time you need.
You will never really get over the loss of your mother but you have to try to remember the good times you had together as like a memorial to her. Holidays, birthdays and special occasions will be hard for you but if you plan a special time in observance of her life and her many accomplishments, it will help give you comfort and peace.
Do something creative like writing or journaling, about your times together to express the intense feelings. You could make a tribute page on the internet to your mother. Maybe put together a scrap book with photos of you all together adding artwork or designs in her favorite colors.
The fact that you are reaching out and asking for advice is a good sign that you are coping the best you can and you will get stronger and be a blessing to others later in their time of grief. Know that she is at peace but its you that needs that peace of all understanding.
I take it that you believe in God so my suggestion is to go to Him as well. Why? Because He understands grief, and sorrow, and pain and loss. He will have compassion. Just talk to him in prayer. Cry out, yell, do whatever you have to but let those emotions out. I promise after its all done you will feel better in your spirit and He will comfort you through His Holy Spirit.
Just remember:
“Blessed are those who mourn, for they will be comforted.” – Matthew 5:4 (NIV)
“He will wipe every tear from their eyes. There will be no more death or mourning or crying or pain, for the old order of things has passed away." – Revelation 21:4 (NIV)