As a mom reading your words brought tears to my eyes, and guilt. I have definitely drank in front if my children, and although I haven't been drunk in front if them, I know I have sacrificed time I could have spent with them.
You will find lots of support in the families and friends section. Also, I do not know how old you are, but you were very brave to post this. You may help other mom's struggling, and hopefully your mom will find the support she needs to stop drinking.