Why do I get headaches at the movie theatre?!

I am an avid movie-goer, and I can't stand the headaches!Like I go to the movies all the time and this is just ridiculous! I would go to the movies, watch an amazing movie like Skyfall, and then as soon as the credits & lights come on, my head is KILLING me! I used to think it was because I wasn't wearing my glasses. So I tested that theory a couple of weeks ago.. THAT WAS NOT THE PROBLEM. Wearing my glasses to the theatre actually made it way worse! Then, I thought it was because it movie is so loud! But I tested that too.. that definitely wasn't the problem because I blast music all the time. I never sit too far or too close to the screen, I always seem to sit in the middle of the theatre. I have no idea what's going on... I hate coming out of a great movie with a huge headache.. it sucks :/ please help!
Why do I get headaches at the movie theatre?!
Post Opinion