I know that I have related before that I should have died three times so far and, with a serious heart condition, am very aware of my vulnerability.
However, for some reason, I am still an optimist, living day by day but still looking forward to tomorrow, and the tomorrow in a few days time when I will go out to lunch with a friend. Even the fact that the friends in my age group are now dying does not cause me to fear my own death.
It will happen, chances are it will be a "kind death" without much warning or pain. Constantly fearing it could well make it happen sooner!