Once, I was traveling with my girlfriend to the Caribbean and she was recovering from a minor sinus infection. Well, she got on the first flight and was in HUGE pain! When we got to DFW, she asked for help at the Admirals Club, and the AAngel was kind enough to find a Sudafed in her purse and give it to her. What aamazing service!!!
So, you might want to carry Sudafed or a similar product to deal with the inner ear pressure that comes from air travel.
*NB: I am not a physician and the above does not constitute medical advice.