I know your pain, sort of. Airplanes I can handle -- it's cars that torment me.
I have suffered from a specific phobia -- fear of highway driving -- since 2002 that, I have to believe, would not have manifested itself if I didn't have UC (Dx'd in 1998 with left-sided UC, mild-to-moderate symptoms ever since). A few months after I was diagnosed, I took a job in pharmaceutical sales (I was so new to the disease that it didn't occur to me that driving around all day with UC would be a form of torture).
After 3.5 years of driving 3-7 hours a day, scrambling to any roadside bathroom when the urge struck (making it, typically, in the nick of time, but twice -- traumatically -- not), I guess the software in my brain made an association between driving and being out of control (my shot clock is more than 15 seconds, but it can't be much more than 90 seconds, at times), because I started having panic attacks for no good reason as I drove on highways (sweaty palms, indigestion, racing heart, dizziness, a disassociated feeling, etc.). It's absolutely terrifying when you're careening down the highway at 70+ mph.
Since then, I have tried to control my anxiety with Zoloft (blunted and sedated me, but didn't help), Effexor (loved it, but it absolutely shredded my GI system, top to bottom), Lexapro (nothing), Xanax (.5 mg BID -- still take it, only mildly helpful), a psychiatrist (worthless) and a psychologist (used cognitive-behavioral therapy -- i.e. confront your fears. Might have worked had I stuck with it, but it became cost-prohibitive). The only thing that has really helped is intense physical activity -- when I am in shape, my anxiety (and UC) is notably less problematic.
Anyway, this phobia (and generalized anxiety) has gotten so bad that, if I had a choice, I'd rid myself of it instead of UC, as much as I hate the disease.