I don't know why it fluctuates either. I've had it forever, as long as I can remember. Mostly it's just there, but sometimes it is really annoying. And the sound and pitch can change. I've had a few times lately that the sound is like a constant drone, as if a low flying small airplane is hovering overhead. Otherwise, it is mostly a high pitched sound.

I wear hearing aids, and when I take them off, the tinnitis is much more noticable and can keep me awake. Yet any noise, like music, doesn't work for me because it needs to be turned low, and that's just aggravating - I can hear only small bits of it, so it isn't soothing, just very annoying.

What is the machine like that you found to help you?