If you eat a lot of fast food or frozen processed food, a change in diet may help along with the other suggestions listed here. It's true that we are what we eat and food can affect the chemicals in our brains. (Damn, is THAT a loaded sentence... I'm sure some of you will have fun with that.)
I'm always amazed by the difference in attitude that my daughter (age 14) has depending on what she's eaten in the last few days. Healthier organic food keeps her teenage moodswings much more in check, but if she eats out a lot at McDonald's and the like she's hell to deal with.
Good food doesn't have to be inconvenient either. Boston Market provides a healthier alternative to most fast food places (if you have one near you), and if you live near a Whole Foods market or something like that (Wild Oats, Fresh Fields, etc) that's a great place to eat as well.
Also, if you drink a lot of soda try water and juices instead. Soda is evil I swear.
While we're on the subject of fear... here's a great article that will make you laugh:
http://sfgate.com/cgi-bin/article.cg...304.DTL&nl=fix
Hope that lightens your day just a bit.
