Trying the most commonly reported frequency of ~8,000 Hz on a tone generator[1] provides a good example of how distressing this can be. If you give it a try, I would recommend you turn the volume almost all the way down before pressing play.
I hadn't thought of doing this; I just informally tested mine to find I've got a dead zone between ~13kHz and ~14.5kHz. I can hear the sound above and below that range - it fades out, then back in as I move higher in frequency.
Nice link. I was able to roughly match the tinnitus in my left ear to somewhere near 12,000 Hz. Mine is a constant super high-pitch so difficult to match exactly. Surprised I could still hear the generated tone that high.
I'm with you. 11.5khz (faded-in, early 50s). The chart has a small dip to the 40 line there. Not significant but I'll take specialness wherever I can find it.
My GP has a theory it's due to damage to my eardrums, from the tubes put in when I was a gradeschooler. Dr was a bit of a butcher but it was the 'deference to authority' age so all the adults were fine with him.
[1] https://www.szynalski.com/tone-generator/