CTH, do you have the sandcastles book? there are some specific things in there that you can repeat to the girls (broken down by age) to help them with some of this stuff. It also helps you understand how the kids feel about divorce at various stages of life.
But I agree that perhaps a counselor who specializes in working with the kids of divorce is probably a good idea if talking to them is not helping.
You're a good dad always looking out for your little girls and recognizing what they're feeling and going through. That's great!
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