wild turkey,
I've had headaches and light sensitivity for a while with contact lenses, and on seeing an optometrist it turned out that my eyesight has improved (!) and the lense in one of my eyes was too strong. The opposite can also cause problems too. It was only 3 months after I had the previous eye test, so even if it's not been long since your last one, it may be worth checking. Anyway, once I had the right strength lense in, the headache and light sensitivity stopped.
I am doing continuous wear with Acuvue 2 (although I'd like to give Focus Night & Day a try), and I am finding that I don't have any problem with flying (just as a passenger, mind you...), air-conditioning (which we leave on in the house almost all summer), or being in the strong sun. I must say I had problems with Acuvue, but not Acuvue 2, so it's worth giving different lenses a go.