Gosh that is awful, babe! How do you prepare children to the iea of death, it's such a complicated all-encompassing concept in its absolute-ness, and it can't be totally grasped by children so young.
My son asked me about Dolly finally, and I had such a hard time making him understand that gone is gone, not coming back. Never. I still don't think he does understand (he's just 5).

Loves and hugs and you too take care of yourself.