I do not fear heart attack as much as I fear cancer. I can defend heart attack with exercise. Other than not smoking and drinking, there is not much else I can do to avoid cancer. My wife never smoked and was not a drinker, and yet got cancer of lungs at age 64.
Death comes for us all. I am sorry for your loss of your wife. Think about it, even Jesus died. He just loved us enough to come back.