It's been nearly a month now since my tinnitus and a 45dB hearing loss at
frequencies >5500Hz started after a scuba dive.

The initial diagnosis is that I had serous otitis media... I just met with
another ENT today who looked at the audiogram from my previous visit with a
different ENT and he told me that I may have had fluid in my middle ear, but
that wasn't causing the problem.  Apparently, it was quite clear to him that
a steep drop in hearing at 5500Hz wasn't caused by fluid in the middle ear
disrupting the function of the ear drum...  He basically said that there was
nothing he could do and that I'd probably have tinnitus and the hearing loss
for the rest of my life.... and then gave me a more optimistic 50/50 chance
that it might go away.  He never said what he thought it was, but now I'm
back to my original thought that it is inner ear damage, like a fistula in
the round or oval window.  The results of the audiogram today were identical
to the one I had a few weeks ago.  My tympanogram readings are "normal"
suggesting that the eardrum is functioning properly.  It may be worth
mentioning that the pressure of tympanogram test causes noticeably more
discomfort in my effected ear than the other.

So... Now I've seen my general practitioner and two ENT's and none of them
can help me.  Though the fluid may be gone, I still have a feeling of
fullness (perhaps it's the near deafness in high frequencies that causes
this feeling -- I don't know..)  How can I tell if I have a fistula or not?

I haven't really experienced any dizziness or vertigo, but from my reading
that does not necessarily mean that I don't have a fistula in the oval or
round window.  I've also read that if it is a round or oval window problem
that I should get it fixed as soon as possible.  How can one test for a
fistula?  Is this something most ENT's know how to do?  I know Dr. Murray
mentions sealing off the ear canal and adding pressure which will cause
dizziness if there is a fistula present.  What are the options? Surgical
graft over hole/tear in window membrane?  Has anyone here had this done?
Was the surgery helpful? Right now I'm more interested in trying to gain
back some (preferably all) of my lost hearing than anything else.

-Trevor