Same with my husband and he's a year and a half post-OHS. Been to our GP, an ENT, had an MRI, CATScan, the whole works...nothing. No hearing loss, no waxy buildup (makes him sound like a floor, huh?), nothing.
It drives him nuts. Our GP also said to live with it. Needless to say, that was the last straw for me with that particular quack. (Don't even get me started on his privacy law violation...)
Our cardio said that surgery can sometimes bring it on...it'll last for what seems like forever and then, WHAM! It's gone. Or it never leaves.