I have had it since I was 13 (60 now). The base noise is filtered out unless I listen for it, but ion occasion I get a temporary deafness, followed by almost a popping sound, then a LOUD tinnitus at a different frequency which slowly fades.

Sometimes I get a new frequency. Since 2000 it has gotten worse, since 2020, much worse. But changing my environment seems to effect it for better and worse.

No doubt mine is connected to my mental illness and probably temporal lobe seizures.