I have found that Tinnitus is really made worse by caffeine. I believe this is because caffeine actually acts as a carrier of mercury through cell walls (Dr. Haley). Mercury then acts like an excitotoxin making nerve cells "fire" without any other stimulation and the resulting symptoms is ringing in the ears (based on some speculation).

I'm not sure the conclusion is correct, but a lot of evidence seems to point that way. So... To control tinnitus, eliminate caffeine. I also personally found that sugar can have the same effect as caffeine to a lessor degree.

Hope this helps.