My worst fear is death. A fear that WILL come true no matter what. Why? Because nobody is sure what happens after death. Really my worst fear is there being NOTHING. AT. ALL. After death.
My worst fears of how I die:
Getting a slow, uncureable or almost uncureable disease. (Such as Cancer.)
Getting gravely injured and dying from the injuries months later.
Getting struck by lightning.
Getting shot.
Dying any way that is not painless.
Also, another worst fear is the Yellowstone volcano erupting at 2:00 AM, while being anywhere within 5,000 miles of it, or so.