Once you die, theres most certainly nothing, you simply cease to exist.

But on a happy note it won't matter how you die, whether your tortured for months before you eventually die or if you pass away gently in your sleep. As you'll never remeber or be aware of how you died.

If you could imagine being a piece of dust squashed between 6000 acres of lead sandwich, thats about as much feeling or awareness of the world you'll have i.e. Nothing.