I am 2 years past amalgam removal. My tinnitus became a real annoyance about 7 years ago. I had mainstream medicine do a bunch of tests, naturally with no answers.
I do still have the noise every time I am still for more than half an hour. It usually goes away after an hour or so. If it doesn't I know I am in for a bad mercury release day: I think that corresponds to Russ's thoughts also.
I do find that if I can get a small amount of water in my ears and press on the earhole than I can get rid of it, even temporarily is good.

Alcan