I have had the condition for over 25 years and, unfortunately, it has not abated at all. I only really notice the condition when there is no background noise and have not had problems with lost sleep or anxiety/depression so I am lucky.
My tinnitus began suddenly after sighting in a rifle at the range. I was using foam ear plugs for hearing protection and when I removed them after sighting in, the tinnitus started immediately and has never abated.
I worked in heavy industrial environments that had mandatory hearing protection...