You should research Superior Canal Dehiscence. I was fortunate enough to be diagnosed with this rare condition after being misdiagnosed with Labrynthitis, Tinnitis, and an inner ear infection. I am having surgery next week to repair a tiny hole above the labyrinth of the inner ear below the brain. This tiny hole has made things miserable. The ringing in the ears, being dizzy, getting car sick, constantly nauseous...but you can hear your eyeballs moving in your head, your bones cracking, and your heartbeat. These symptoms came on suddenly without notice. People think I am crazy, but there are several articles online if you research the disease. It is commonly misdiagnosed because it is rare and hard to find because the hole is so tiny. The ENT must know what they are looking for. I hope this isn't your diagnosis, but if so, this information could be helpful.