Most of us are prone to worrying about things, some more so than others. Often we find ourselves worrying about things we have no control over, or fretting about the things that could go wrong. Try to look at things more positively; instead of imagining the things that could go wrong, think about all the things that could go right. If a situation is out of your control, try not to think about it until it comes to its natural conclusion.
Do things that take your mind off worrying about a situation, even if it's just for a short while. Your body will thank you for the distraction.
Know Your Limits
There is no pointing stressing out about th