This happens to me from time to time! It really is bizarre. I’m hyper attuned to sound, particularly which direction sounds are coming from. When a sound seems to be emitted from within your own head, it creates a disorienting sensation that I experience as a sort of extreme vertigo. For me the sound is never really abrasive and usually manifests as a woman’s voice calmly saying one or two words. The disturbing part is just how “clear” the sounds are, like every other sound I’ve ever heard seems distant in comparison.