Hi Cheryl,
It is really hard right now, and you are really sad. Losing a person you loved is very difficult. I lost my husband more than a year ago and although I am doing better, I am still grieving. I had my bouts of despair and guilt. There are many things that I would liked to have done differently, but I did them with the knowledge I had at that time.
This is a difficult period and with time it will mellow. Of course, yor kids will notice that you are sad... is that bad? Talk to them about it, they understand. Your children will also help you sometimes to "forget" your loss and grieving and give you some relief, be open for that. Try to take it one step at a time and follow your intuition. Take time to cry and remember your mom, may be after the kids are in bed. I don't know if all this advise helps, I remember that I felt that nobody understood the pain and sorrow. I went to many grief counseling groups and I found them most helpful. May be there is one in your area you may wish to attend after a while, wait a few months though.
I wish you lots of warmth, and a big hug in this difficult time.
Renee