Sick?

I've had this lifelong fear that I'm about to die. Maybe I have some form of cancer or disease that the doctors overlooked. Maybe I have a heart condition that no one really thought about... Something along those lines.
And now i feel like it's progressing. I always feel sick...
but then again, I may be a hypochondriac. If I think I'm a hypochondriac does that make me one?
Or maybe i'm depressed.
I just feel like there's something wrong with me and I'm not sure what it is...