Ajahn Brahm offers many great ways of overcoming phobias, such as using awareness, compassion, kindness, catching it early, relaxing the body and so on. Ajahn reveals that some phobias can be traced to previous lives and finding out the reason behind your phobia can take away a lot of the fear, which takes away a lot of the problems.
Teachings are available for downloading from the BSWA Youtube Channel, the BSWA Podcast, and Deeper Dhamma Podcast.