I've had tinnitus since 1996. It started as a high-pitched hissing, and the a few months later, a low-pitched hum was added to the mix. I habituated to the hissing, but the humming nearly drove me to suicide. I could feel it in my ears as well as hear it. I hear the hissing all the time, but it doesn't interfere with my life anymore (took about 4 months for that to happen). I don't like it, and I certainly hope that it will go away someday, but it no longer keeps me awake or gets me down like it used to.
I know this is controversial, but the only thing that ever made the humming go away was various antidepressants. People have stated that antidepressants can make their tinnitus worse, but I've never had that experience. I had good luck with Lexapro and then later, Pristiq. I'm not suggesting this will work for everyone, but I'm convinced the humming in my head stemmed from depression from which I've suffered in one form or another since I was a teenager.
If the noise in your head is ruining your life, I would suggest talking to your doctor about an antidepressant. I resisted doing it for years until I had no other choice. There are some really good ones out there, and the side effects are not as bad as the older ones. In fact, I've had virtually no side effects at all.
Just my two cents. Hope this helps.