This is not a question related to altitude sickness when hiking in very high locations but related to long altitude flights.
When I take an airplane, especially long hauls, I get a terrible headache. It grows little by little, and by the time I reach around 6 hours fly time, it gets very hard to handle, with pain and nausea. Once the plane lands, I am a zombie for some hours and then the pain disappears little by little.
Up to now I haven't found a solution, I just take some ibuprofen pills before the flight and sometimes it works a bit.
I'm not able to sleep on a flight so the problem is even worse.
It's not motion sickness, because I don't have it, and in any case there's not much movement when the plane is in cruise altitude (except for turbulence, but ok), so I'm convinced that it's somehow related to the low pressure that the plane has inside the cabin.
Obviously, no doctor has been able to solve the issue, so I would like to know if anyone out there has/had the same problem and how you solved it.