Oh ((((sweetteewalls)))) I know that you want to keep all the pain in the world away from your precious children, but that's just not going to be possible. I agree with Katiekate that it is a good thing she feels loved and safe enough to tell you when she's sad...to be able to put it into words.
Little ones will always want mommy or daddy who left to come back home. In time, though, it will get better for you all. I hope you were able to get some sleep last night.