I had exactly the same thing on a recent flight (as a passenger) to germany, about halfway through descent to land (so probably through FL150?)
the pain was unbelievable. I was worried I was having some sort of 'brain explosion'
. even thinking about it now is making me wince!
I'm 32 and in peak physical fitness. If I do decide to try and go all the way to ATPL, I worry that this might be a stumbling block...