I've been dealing with tinnitus for about a year now. The only thing I've found that helps is Ginko Biloba. I'm buying that at a "Dollar General" store so the source is iffy and so is the effectiveness, but it certainly does help.

My wife has a friend who told her just a few days ago that her husband has had some success toning his done by chewing Bay leaves. I've not tried that yet, but I will soon.

From what I've read there is still no "cure". But those two things may contain a clue that's worth looking for.