While the loss of any loved one is always hard, the loss of a parent - mother or father - is especially hard. These were the people we always relied on for comfort and counsel. Losing that means losing a part of who we are.
My dad died five years ago and there are still times when something happens in my day that I start to call him on the phone to talk with him about it before remembering he is no longer a phone call away.
My sincerest condolences on your loss. There really are no sufficient words to ease your sorrow at this moment. Just know that while the hole never completely goes away, it does get easier with time.
DAMN! This SUCKS! I just had to go to the next higher age bracket in my profile! :-(