My normally persistent hiss disappears regularly when I’m in the office, which is on the 9th floor. It almost never disappears at home (2nd floor), despite home being a relatively noisier place. It returns when I’m back at low altitude. Go figure!!! I’m considering moving to a new apartment that is on a significantly higher floor! 
I have severe menieres attacks at sea level and whenever storms are approaching. I had no menieres attacks for 2 years while living in the mountains at 3000ft elevation. Having severe attacks again at 600ft elevation. Guess where I am moving.
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Very interesting! I hope this eliminates them for you
Guys I can confirm this is definitely a thing. If you have high hiss like tinnitus try a holiday in the mountains or go to an upper floor of an office building and tell me how your tinnitus is