allister,
In my company one of the company Doctors is specialized on treating people who had bad experiences while on duty, and people scared to fly for whatever reason. We are encouraged to see her in case we don't feel comfortable with flying. It happened to many after 9/11, or after the Concorde accident.
I personally don't have problems with flying to the US, apart of the fact that I find the so called "security measures" totally idiotic and a huge price to pay for window dressing and avoiding funding effective but expensive measures such as explosives detectors and pax profiling.