Thanks, Nick.
Unfortunately I've been to several ENT doctors, audiologists, and neurologists etc. I was very hopeful in the beginning that they'd find something deep in my ears but nope ... never an answer. Mine is bilateral meaning it's both ears and it seems to be my whole brain making the noise. You know the way your thoughts just sound like they're from your brain, and not from your ears? That's how this is. My brain is just constantly full of mosquitoes. On helium. Mating with bumblebees. In a tin can. With radioactive sand poured on top. And some fax machine squonk sounds added in just for variety.
I must admit I had seen OZZY in concert just a couple of days before it started. The thing is that I didn't have any ringing in my ears after the concert, or the next day, or the next day ... but then BAM! It started and never stopped. The audiologist said my hearing is fine and I don't seem to have hearing damage from OZZY, but who knows.
I guess if I had to blame someone for this, he's worth it. OK, almost worth it. 
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I never give you my number, I only give you my situation.
Beatles