Ringing in the ears may have a fix coming. I’ve had a mild version of this problem, since I lost 50% hearing in one ear a decade ago. It’s a frustrating constant whistle. You sort of learn to ignore it.
This new research looks hopeful for Tinnitus:
http://www.iflscience.com/health-and-medicine/new-device-could-help-silence-tinnitus-by-lightly-zapping-the-brain/