I have high pitched 7k hz bi-lateral ringing, 24x7. I've had it my whole life. I am convinced part of it is due to being born very premature (I was 1 lb 11 1/2 ounces). I believe it may be cervical and/or neurological (vascular, specifically).
It's so frustrating because nothing has happened. Masking only does so much. Sitting around reading a book, or trying to sleep is almost impossible.
I've been wanting to make a documentary style video on this diagnosis/issue, because a more people suffer like this than people realize. One medical professional that was helping me passed away a few years ago and that still eats away at me, because he really cared that he wasn't able to help me and it ate away at him. I still miss him.