@Dr. Nagler out of curiosity how often do you hear yours? I remember reading Shatner's experience and he stated he only heard it when he consciously focused on it. I don't know if it's the same for you.
I of course hear it whenever I purposely try to hear it, which is almost never because ... well, why would I? Why would anybody?
And in addition I might briefly become aware of it for whatever reason maybe once or twice a day. But whenever that happens, I generally become unaware of it again within a minute or so. Why? How can that be if it's so LOUD? It's because I don't care. I just don't care. And in the final analysis that's what habituation is all about - not caring.
Stephen Nagler