Any swimmers with hyperacusis?

I wonder if there are any swimmers out there who have this problem and
associate it with swimming.

<http://hubel.sfasu.edu/courseinfo/SL98/hyp1.html>

I seem to be highly sensitive to certain frequencies in the range of
industrial capacity ventilation system machinery. In my case, there is
such equipment in the parking garage below my apartment, but it is far
away from the floor of my apartment. But the humming noise seems to
resonate through the concrete of the building and fill my ears with
annoying humming.

This only started about a month ago. I have noticed it in earlier
years, but it only lasted for short periods of hours or a day or two.
Now it is consistent whenever I am in my building. And no one else I
have talked to there seems bothered by it. When I use earplugs, the
sound is much reduced, so it is real sound, but it is apparently
amplified so that I hear it like a dog hears a dog whistle.

Coincidently, I no longer get water trapped in my ears when swimming.
It just drains out immediately as soon as I leave the pool. I used to
get water trapped in both ears allthe time, and I would have to shake
my head repeatedly, sometimes hours later, to get it out. This tells
me that my ear passages have opened up, rather than becoming more
constricted, which seems odd. What might cause that opening up?

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