I read somewhere that when we are born we only have two fears, loud noise and falling. Mayby the heights thing is to do with the falling we were born with. Apparently all other fears we create.
When you expose yourself to a fear, thing to remember is to do it (whatever you are scared of) and still expect to feel scared. Repeated exposure reduces the symptoms.
Studying it, reading about it, talking about it didnt help me when i had anxiety, it just fuelled the fear. Just do it, feel scared, do it again,feel little less scared and so on until it comes down.
Its a case of showing your fear centre in the brain that it is safe, but your brain will still react with fear initially. Treat it as lagging behind your consciousness a bit.