I was sick the first week after coming back. Probably the recycled air in the airplane. 14 hours of recycled air can't be good for you. Maybe most people just get used to it.
I'll be flying again soon. My first flight since 9/11/01 (well, my first flight since the trip home from Germany, really).
I'm not too worried.
I just hope the security people don't try to hassle us too much and ask me to demonstrate how my cameras work (to make sure they're really cameras) and that kind of nonsense. I get irritated at things like that, and I make it so people know I'm irritated. And that could cost me my flight.