Listen to music keep yourself busy go out walks on the beach exercise play sports go to the mall with your friends a nice dinner spend time with family smile for no reason enjoy the little things you have now cause tomorrow there's a chance you might not have them :)
Try this simple breathing exercise: inhale, deeply, for a slow count of four; hold your breath, for a slow count of four; exhale, completely, for a slow count of four; and repeat, until you feel calm. Another way of dealing with stress is meditation. There are books you can borrow from the library which will teach you how; google "How to meditate", and you will find lots of sites with just that information. Last of all, there is prayer. Recently, I started praying the "Divine Hours". What that is, comprises seven short sequences of prayers, at seven different times every day. Now, I realize this is not for everyone (I'm more able to do this kind of thing, as I'm retired), but even praying once a day can make a huge difference in how your life is lived. It really does help me to center in on what is truly important.