Sorry you're feeling this way and I hope that soon things will start to improve for you. I think you will be ready to move on soon enough and then you can rebuild your life for you and D3.
Kids always seem to suffer the most and us LBS feel terribly for them. We don't want to be part-time parents but we're left with no choice. Kids have no say in any of this, they're just bystanders watching their lives change right in front of their eyes because one person (their own parent) has decided to be selfish and self-centered. However, there's a glimmer of hop in that kids adapt to change well and can learn to have a happy life even in the non-ideal situations.
((((hugs)))
Me: 35|WAW: 38|D: 6yo | http://tinyurl.com/2dxx7m6 Feb 2006, left, came back in two weeks Aug 2006, left again Apr 2007, filed for divorce Dec 2007, reunited Mar 2010, moved out, filed again