I can't tell if it's just me or something with flights but recently when I take flights I get an intense headache that isn't similar to other headaches.
For a few months, I used to have headaches too in the last 10 minutes before landing of every flight. Since I had a surgery for my sinusitis a few months before, I thought it was because of some air pressure buildup in my maxillary sinuses that wasn't returning to normal air pressure fast enough. Now every time I am close to landing I make sure the air circulates through both nasal cavities very well and I haven't had any problems anymore.