I guess I'll add my two cents, it may give someone a little hope out there.
In my earlier days I was an EE dedicated to high end audio. Built my first tube amp at age 13. Fast forward twenty years and I was at the top of the game, designing some of the highest quality and loudest systems out there. You can see where that is leading to. In the same time frame, a few exposures to 105mm jeep-mounted cannons in the Army didn't do my ears any good either.
15 years ago I woke up and my right ear was chirping like a bird on steroids. Sort of like a high speed Morse code, if you will. Visits to Audiologists, brain specialists, etc. only reinforced what I already knew, this was here to stay. I set about doing intensive research, exhausting all resources. It sunk in after a short time that there were no silver bullets. Finally, I had to accept it and live with it. The first 8 months or so was not easy but afterwards it melded with the brain and became a part of normal living. Just had a few birds inside my head was all.
Ten years slide by and one day I realized that the chirping was gone. I tried to call it up. If I could hear it, everything would be normal. I almost wanted to hear it, if you can believe that. It occurred to me that it had been a while since I last heard it. It had gone away completely on its own, unnoticed. I wish there were something I did that I could relate to others here to try out and maybe help them but it went away spontaneously.
That was five years ago. At 61, I feel very lucky and not a single day goes by without thinking about it at some level. I wear ear protection for everything. Sometimes I get mad when I go to the movie theater and they have the volume up so loud it will cause ear damage no matter who you are. Should be a law...
The gist of the story is: If you have it, it may not ever go away, but on the other hand....
