hang in there, after a period of grieving you will come out the other side stronger. For me the grieving is now on and off. It's strange, I don't want to go to that place and feel the sadness, but more often than not I feel like it's helpful to feel the pain. The pain keeps me honest with myself. Or else I become completely detached and all I have left is "why the hell am I still here."
I do get stressed out also managing the kids and basically everything else in this house. try to make time for yourself and find ways to de-stress. Your kids will be happier when you are happier.
