Defy it. Show defiance toward your anxiety and the physical pain it can cause. Have an attitude and say to your anxiety : Is this your best shot? You can't do better? . Anxiety is a burglar trying to break into your mind. It wants to steal your peace of mind, give you pain; just fight back with a psychological baseball bat.
When an anxious thought come into your head. Just see it as a popular 6 number lotto. Your chance of this frightening idea that comes into your mind will happen is in the 1 out of 20 million. So discard it as an imaginative film script or a very creative brainstorm.
Have the courage to go to the root of your problem. Go to personal or group therapy. You are not alone, 25\% of people have anxiety disorder.
Learn to give yourself permission to fail, to have hobbies that are pleasing to you and to know that your are loved unconditionally.