10khz tone is what I hear, all day, every day, nonstop:
https://wooferbasstest.com/sound-test-1khz-5khz-10khz-16khz/sound-effects.html
Mine started at age 5 or 6. It would come and go. Usually when laying in bed waiting to fall asleep. Now more than 70 years later, I have the 10KHz tone all the time. I try to ignore it and that helps. Nothing has ever worked. Maybe someday a cure will be found.