I'm not part of order, nor am I a friend,
you'll be able to tell when I turn the bend.
When I come round, you'll start to worry,
and maybe even break out in a hurry.
You might feel me in your bones or in your gut,
but maybe, just maybe, I'll get you out of your rut.
Far more likely indeed I'll just make things much worse,
thankfully I probably won't make you require a hearse.
The word has seven letters.