It sounds like a response to lack of control. You can't control whether or not your car breaks down or something happens to the ship. None of us are in control and we have to have some faith in whatever higher power you believe in (even the flying spaghetti monster) that nothing will be handed to you that's too great to handle.
Grant me the serenity to accept the things I cannot change,
courage to change the things I can,
and wisdom to know the difference.
That works for me. I just take a deep breath (like when I was trying to get back from Texas and my flights were cancelling left and right), blow it out, and turn my worries over to my higher power (I've grown past the flying spaghetti monster, but whatever works).
Smoking a little weed helps, too.