I feel lost too. Nothing seems to change. But my H is also in a new relationship. I'm slowly realizing that I can't control him or them, so I have been moving my focus back to myself. What can I do for myself. And I'm slowly finding pleasure in the things that before reminded so much of my H that I thought I could never do them again. There is a life after DB and you and I will both get there. Eventually.
That said, I can't believe your H told your kids nothing much would change as he would still see them all the time. Mine also doesn't quite seem to grasp how much a divorce affects children. And he's even shipping os off overseas. His own mother even told me that he will pay the price for that one day.
You are not alone. I'm here and I'm thinking about you!