I've had it for many years. For the longest time I heard it in the quiet of the night and actually thought it was crickets chirping outside. Then eventually in my in my early 20's wondered why there'd be crickets chirping in the middle of winter.

ENT is a good choice for other reasons. But there is still much really unknown and undecided about tinnitus. My ENT is pretty pragmatic. He told me that I should not expect anything to solve it. But that sometimes some things seem to work for some that do not work for others.

At one time the B12 injections I take for another issue seemed to mitigate it for a while. As do high doses of antibiotics... sometimes and also temporary. Hopefully your tinnitus won't be as permanent. But I think that is unlikely. Other than times you don't notice it for a while.

Now in my mid to late 60's the quiet chirping is more of a high pitched buzz. Most annoying even during the day as I type this.

The concussion thing is interesting. Never heard of that association before. However I did get concussed when young and a teen. But I was also exposed to loud noises from flying and target shooting and all sorts of other loud stuff. Sometimes I blame those foam earplugs I use to wear a lot. But my tinnitus was beginning earlier than when I started using those.