I second
@ZFire's experience here.
It came on after tapering Prednisone and took MONTHS, but it did fade and occur less and less.
As far as filling in gaps, there's no rhyme or reason to it. Sure it could be nerve damage, it could be rebound inflammation, but the neuro I saw basically said it sounds like "that area is sensitive to stimulation and gets stuck in a loop". White noise actually HELPED me out with the mimicry.
Certain SSRIs and Na blockers in low doses also seem to help.
Benzos make it "quieter" but it doesn't stop, and then there is re-bound mimicry I have to contend with for days.
Mine never really went "away" but it got a lot better, rarely occurs now unless:
1) I do steroids again
2) I come off any GABA drugs
3) I hear a VERY loud sound repetitively in the 1-1.5 kHz range (training my nerve pathways to fire, guess that path is "sensitive")
Even then, when it comes back, it lasts only about a week.
It's only ever been the right ear, but I have chaotic tinnitus in both, which has had more frequent moments of true volume reductions. Sound distortions in music haven't really changed much, but if the volume is quiet it is ok until the distortions ramp up over the music. The type of music matters too, if it has a lot of noise going on instead of 1-3 distinct instruments, it will get bad.
I was supposed to do an ABR as I'm guessing this might be nerve related really, but I was told by the audiologist that it is an hour long test of a single pulsating beep at ungodly sound levels (90ish dB+). She said it actually gave her tinnitus and thought it'd be nuts to do it on me. She might've saved my ass.
Save steroids for hearing loss, I had some over a car trip occur, very unfun and scary shit.
Steroids worked (really well, haven't had such a good audiogram since pre-tinnitus) and the insane extra tinnitus has come down back to its previous bullshit baseline, so the increases (which were suicidal) are in fact temporary (backs down over 2-3 weeks once off the steroids). I taper quite slowly, and also used Dexamethasone this time instead, which has a much longer half-life and to reduce any cross over to screwing with inner ear fluid homeostasis. Worked just as well when dose adjusted (1 Dexamethasone : 7 Prednisone equivalent).