Earlier quoted context omitted.
I just think of that ringing as the sound of silence.
One interpretation is that nearly every person has some degree of tinnitus, but many are almost completely unaware of it - it's just perceived as silence under most circumstances. I hit my head once, and lost all hearing on one side; some of it returned after a week or so. When it did, I was extremely aware of my pulse thumping through my head, bones crunching in my neck, as well as minor fluid whooshing sounds when…
And I think I remember a few times in the past that I noticed a very, very mild ringing when I was concentrating hard trying to hear it, but maybe that's a false memory I'm inserting after the fact that I know I've got it now? I don't know.
But in mid 2019 I started noticing that it was loud enough and persistent enough I couldn't ignore it easily anymore (I can for periods of time, but I have to actively distract myself now, whereas before I didn't need to).