Jean, when I read your post, I was about to skip over it, because I've never lost a spouse — or a child. So how could I truly know what you're feeling, and how could I possibly say anything that could help?
But yes, there is something, and a couple of the other responses reminded me of it. In the past, I've seen it suggested mainly to people who have lost limbs or the use of some facuty central to "who they are," but it can be applied to any loss, and it's this:
Find someone whose problems and losses are greater even than your own, and help that person.
I know it sounds simplistic, and it takes a shift in your thinking to wrap your head around the idea, but it works. My Aloha,
Ned