Anxiety
It is actually your thoughts about any given situation that produce symptoms of anxiety. In order to change your response to seemingly frightening situations, truthful statement about what triggers your anxiety must replace catastrophic thoughts. By replacing a statement that helps you cope with the sensation a negative stimulus creates, you will lessen and eventually eliminate the impact of that perceived danger.
By learning to counteract the physical symptoms of anxiety you experience, your symptoms will diminish and you will become desensitized to them.