I am devasted to hear of your loss.
I also must say that as you well know, alcohol will rob these beautiful little girls of their father and you are all they have left.
Get some grief counseling, have friends, family watch the kids. Get some help for yourself before they lose you as well.
Yes, the beginning is the easiest in some cases, the shock of it all, and all the work that needs to be done keeps you occupied. It's when you go back to the normal 9-5 day that lonliness and grief can be overwhelming.
Do not try to drink this pain away, it will never happen. Talk through it, work through it and be all that you can be for those precious babies that you and the woman you love so dearly made.
I will keep you in my prayers.
Beth