I had a sinus infection about 8 years ago which resulted in Eustachian tube dysfunction and chronic sinusitis-not sure which caused the ringing, but it started a few years later-I'm a pilot so took a simulator instructor pilot job in Japan "Didn't have to fly" . I notice the ringing and sinus problems where greatly reduced living by the ocean-I came back to the US and it all started again-I went to a few ENTs no help, but did find one in San Diego, Dr.. Brain Weeks "Class act". Two weeks ago, I had sinus surgery and Eustachian tube dilation-The ringing is gone and my ears no longer feel full. I wish everyone the best of luck