What can you do to help yourself if you have an anxiety disorder?

Stay active. Exercise is a great way to relieve stress. Your body releases endorphins during exercise, which can help you feel calm. If you exercise 30 - 60 minutes a day, your stress levels can improve. When stressed, take 5 slow, deep breaths with your eyes closed, then roll your shoulders forward 5 times, then back 5 times. This will slow your heart rate and release tension in your neck and shoulders.
Avoid avoidance. One of the keys to preventing an anxiety disorder from worsening is to avoid avoiding what increases your anxiety. Exposure to the anxiety provoking situation or thing will actually improve your ability to deal with it. If you cannot do this on your own, seek help from a trained cognitive behavioral therapist.