The Divers Alert Network
did a little blip in the Alert Diver not too long ago on this very subject. You may wish to contact them (or do a search on their site) for more information.
However, I would like for you to ask yourself something: "do I have fears/anxiety in other areas of my life?" What precipitates those fears, anxieties, emotions? What is the premise of that anxiety or fear? Fear of dying, getting eaten by a big animal, drowning, what? Furthermore, if these emotions are happening in other aspects of your life, I would recommend conseling. If you really need to dive, I would still recommend counselling to work out those fears. Some divers have panic attacks in everyday life and are on medications to help alleviate the symptoms. Some divers have panic attacks underwater at bizzarre times and many proponents have attributed those episodes with Nitrogen Narcosis. As I stated above, look into DAN; they are the major resource on diving.
After you have conquered the fear, I would take a refresher course with an instructor you feel comfortable with and is patient.
I wish you the best of luck in conquering this.