Seem to have habituated (knock on wood)
For the last month I've had Eustachian tube dysfunction with fluid in both of my middle ears. With that came, what can be, horrible screeching reactive tinnitus in my left ear. White noise machines are no good against it unfortunately, and I have to sleep in a totally quiet room. The right ear has normal Tinnitus.
What made any kind of habituation difficult was that, due to changes in pressure in the middle ears, the Tinnitus evolved day-by-day. So I never got a chance to get used to it, and became fixated on what new sounds await me the next day. Also, sometimes the Tinnitus would trigger my heartrate to increase, which made the Tinnitus louder, which would make the heartrate increase. Very frustrating.
Well yesterday, the Tinnitus seemed to have stabilized long enough and I marveled that I was not paying attention to the Tinnitus at all. I can hear it when I explicitly pay attention to it and it is still doing its annoying thing. The reactive Tinnitus portion is weird because it's still reactive, it's just doing it quietly in the background now when I'm not paying it attention.
When things are totally quiet and there is nothing to focus my attention on, it's all there in it's glory. So sleep is still difficult. But during the day it has been great, all things considered.