I've flown alot.......
My last trip out to Vegas, I found out I had bad sinuses......
half of my face went NUMB as hell, extremely painful. All our medication was packed in with the luggage so I couldnt get to it.
I'm leaning forward, backwards, nothing helped.......
Until when leaning forward, I leaned back suddenly and I hear "crack crack crack"...... all the pressure was relieved........ The cracking must have been my sinus cavity clearing out......
Man that sucked....... on the way home before I got on the plane I loaded up on sinus medication.......