Hi, Rebecca, from another seasoned widow.
I'm so sorry for for the sudden loss of your beloved husband and the father of your children. I lost my first husband after a prolonged illness, but my second husband died very unexpectedly almost 3 years ago. The shock of my second husband's death (unknown heart disease) was very overwhelming.
As my friend Rob says, make sure you keep drinking water, eat when you can, sleep when you can, and keep posting here.
This place has been a lifeline to many of us.
Hugs,
Maureen