lou, is your phobia of a highly specific thing ? I saw someone cured of a terror of loose shirt buttons.
Is it on the other hand more general, maybe a fear of crowded places, traffic jams, feeling trapped, no loos available, that sort of thing ?
The first type of phobia can be tackled head-on, the second is trickier and relates to fear of loss of control. Having been a martyr to the latter, my experience is that it is unlikely to be eradicable, but you will gradually find more good days than bad ones, and it goes hand in hand with how settled and satisfying the rest of your life is.