Are you serious?
It happens. If it does, fine, you won't really know it. What does it mean? Nothing. Sure, it may affect the people around you but what does it mean to you, personally? Nothing. You just wouldn't be there, wouldn't know that you 'died'.
Worst comes to worst you'll have a few hours of pain before death, but it will pass...
If?
I'm not scared of death, it's inevitable, you can't prevent it, you can't control it (well to an extent), why worry about something out of your control?