Death statistics from Purdue University:
Tracking 1,663 men for twelve years who were between the ages of 43 and 91, researchers found that those who were able to decrease their anxiety levels (or their levels of neuroticism) decreased had survival rates of 80 percent compared to 50 percent of the people who couldn't control their neurotic tendencies.What does this tell you? It tells me that you're far better just calming down and going with the flow. Nobody's out to get you. Just remember that things will typically work out in the end. Whatever it takes to calm you down you should focus on doing just that, after all, there's no reason to get worked up. As this research shows you're better off not getting to worked up so there's really no productive purpose in doing so.
Incidentally, if you struggle with anxiety it has been shown in the American Journal of Epidemiology that vigerous exercise can decrease your anxiety substantially. So go for a run if you need to calm down. You'll be benefting your body in multiple ways.
American Journal of Epidemiology