Oh wow, I've never heard this was a thing other people experienced. I've had it for a while years and years ago, when I was under a lot of stress from my studies. The loudest, distorted synthesizer fog horn I've ever heard — and it was all in my head.
Thunder in your head?
A long while back I was hanging out with one of my sisters and she said that she hears thunder in her head when she gets startled....