windyshores,
You are right - it is in the brain. I’m sitting in a quiet room writing about tinnitus and it’s really loud!
I am about to get up and feed dogs and also talk to dogs. I know that I won’t be aware of it then.
I saw the ent last week. He was taking it seriously, but was not very encouraging about it going away. He said that it could be from plane experience or just the beginning of hearing loss.
He scheduled a hearing test and put me on antibiotics and Claritan for five days.

Mine too. I know, for me, it increases with anxiety or vigorous exercise and then gets less loud the calmer I get. Unfortunately it’s still quite loud all the time