I've had tinnitus since I was a teenager. Probably something to do with factory work on an assembly lines and raves. It comes and goes. I've learned to keep my stress down and to avoid all stimulants, so no tea or coffee. Once in a while I hear silence.
I felt really down about it for a long time. I used to hate hearing it, and I heard it constantly. It was a bad day whenever it was acute. In the last five years or so I've learned to listen to it. The spectrum varies a lot. Depending what's playing, I can tell how tired I am, or how much pressure I'm carrying. After I make that judgment it usually subsides. Can't say why, but the intensity has a lot to do with how mindful I'm being.
I found coming to acceptance helped.