I have had tinnitus for years before my cancer and the usual answer is there is no cure. I read an article about it and it said some people go to clinics to learn how to live with it. It gave the example of William Shatner as having been too close to an explosion during Star Trek and getting tinnitus and going to a clinic to learn to live with it. I hope the doctor involved in a study regenerating cochlear hair has some luck. There does not appear to be much work being done on tinnitus.