Holliwood--I feel your pain, honey. I'm going through this, too. Please feel free to PM me if you need some moral support or just need to vent.
I will tell you right now that the emotional roller coaster you are on only gets worse. It seems like everyday I feel something different. I was devastated at first and then furious. I remember my first week was awful. I must have looked like hell because everyone kept asking me if I was ok. I cried all the time, over anything and everything. Then I got mad. REALLY mad. I probably said and did some things to him that I shouldn't have, but it felt good!
I've kind of moved into the pleasantly numb/really don't give a damn stage, but will slip back into being sad or angry very easily. It's easier when I don't see him, but then again I wonder what he is doing with his time, who he's seeing, etc. If I start to dwell on that too much, it makes me crazy!
I have a soon to be 5-year old who is not coping well with the situation. At least your children are old enough to understand most of what's going on. My little guy just thinks his daddy has abandoned him no matter what I tell him or how much I attempt to console him. My son is my rock and without him I don't know where I would be. It breaks my heart to see him affected by his father's carelessness, but all I can do is continue to show him how much I love him and to keep all of the promises I make.
Keep your chin up and take care of yourself! Again, please PM me anytime if you need to!