Angle -- here's my two cents on tinnitus. Anytime someone gets it for the first time or they experience a sudden change in their tinnitus they should go to an
otoneurologist (a doctor that specializes in the interface between the ear and the brain) or ENT and get whatever can be ruled out, ruled out. For example
pressure problems in the Eustachian tubes connecting your middle ears to your throat, an increase of fluid in your inner ears (Meniere's disease) or any other condition that disturbs the fluid pressure in your inner ears. In addition, tinnitus may be caused by tumors on your auditory nerves (acoustic neuroma)
As an example, I have always been hard of hearing but a few years ago I experienced a drop in hearing in my right ear along with changes in my tinnitus in the same ear. It became louder in what I estimate to be the middle frequencies. I went to an otoneurologist and he recommended I go on steroids for a short period of time.* Both my hearing and tinnitus went back to what it was before.
Often after an otoneurologist or ENT rules out causes that can be dealt with either surgically or medically you (generic you, not specific you) may still have tinnitus. This is because as others have explained upthread, tinnitus is often a symptom of inner ear hearing loss. Much like an amputee will sometimes still experience feeling in their no longer existing limb, a person with inner ear hearing loss will often experience hearing phantom sounds, or sounds that other people can't hear. In
rare cases it can even sound like music or the background chatter of a radio station.
For many people it can be enough for them to know that this is their new "normal". Once they understand that, they can relax and get use to it. Some people need help getting use to it and will try meditation. Other people will opt for white noise machines.
If you have finished ruling out medical conditions that require surgical or medical treatment, I hope you will be able to relax and get use to it.
I know it must sound weird for someone new to tinnitus, but if you don't consciously think about it, my experience has been that it starts to sound quieter and becomes part of the background. When I think about it then I become aware of how loud it is and how many different sounds I'm hearing that no one else is. Thinking about it moves it into the foreground and makes me more aware of it. I have gotten pretty good at ignoring and it almost never bothers me though, if I stop to think about it, I always "hear" it. In fact, I can't remember a time that I have never had tinnitus. But it doesn't bother me.
And some people even learn how to use it to their benefit!
Musical Ear syndrome has been around for a long time. Composer Robert Schumann also heard auditory hallucinations toward the end of his life. At night, he heard musical notes and believed that he heard an angelic choir singing to him. He also heard the music of Beethoven and Schubert. He jotted down the music in February, 1854 and called it the Theme (WoO, 1854). He said he was taking dictation from Schubert's ghost.
I wouldn't mind having that kind of tinnitus!
Hope my two cents helps.
--
* FWIW, my understanding is that ENTs don't know how many times steroids are responsible for reversing the decline in hearing loss or if the loss would have reversed anyway on its own. But despite that, many ENTs will prescribe steroids when someone experiences sudden hearing loss.