I believe the standard treatment in that case is exposure therapy, in which with the help of a therapist you trigger the chain reaction so you can practice and

I believe the standard treatment in that case is exposure therapy, in which with the help of a therapist you trigger the chain reaction so you can practice and become adept at navigating your feelings and reactions to these things. More generally, asking "why do I believe X" is a helpful beginning point for this kind of self-reflection.