I have something similar - or rather I thought I did.

An incredibly high frequency sine wave noise almost inside my head.

I remembered when I was younger (a long time ago - early 80s) that I used to be able to “hear” when a computer CRT was on in my school computer room (uk, so BBC micro, with the standard monitor).

Ultimately I figured out I could hear the switching frequency of poorly designed / made power transformers.

specifically 110/220v to 5v or 12v transformers and cheap USB outlets.

I spent a day up close and personal around all my power outlets and now my head is clear of that super-sonic ultra high frequency nightmare.