Nothing can be done for it
My colleagues and I have had decent luck with it. Maybe a 50% success rate, which is really low for us overall, but pretty high for tinnitus.
I've had it for about a year now. I've mostly been able to ignore it, but some days it's freaking maddening.
It's the primary form of treatment we use in our office, and I have other colleagues around the country who've had good success using it for Tinnitus.