I can't even imagine what you must be going through, I'm sure time will help to ease the pain. When my old mans time is up I'm going to be a mess, I've warned my wife of this many times.
so sorry for your loss, its tough to lose a parent or anyone close to you. i know its hard to stay positive with the roller coaster of emotions you are going thru right now. lean on friends and family when things get to be too much and remeber the good times you shared with him.....