I have something similar, I tend to describe it to people as a light tinnitus. It's a permanent high tone, but I don't usually notice it unless it's very silent

I have something similar, I tend to describe it to people as a light tinnitus. It's a permanent high tone, but I don't usually notice it unless it's very silent around me or I intentionally tune into it, and even then it's not very loud. Never mentioned it to a doctor. I think I know which loud disco I got it from when I was about 7.