yep, it is a true, and it does not go away for long. I went thru diagnoses and treatment at OHSU Tinnitus Clinic. They will have the best information on their website.
They do make hearing aids with sound generators that mask the sound. But, they are a bit expensive and the testing takes some time to duplicate the sound in the ear. What I learned is that loud sounds, lawn mowers, guns, machinery, etc are the primary cause but there are others. It kills the hair folicles in the inner ear and result in a loss of high pitch hearing. The loss of hearing is replaced by the brain and that is where the tinnitus (noise) comes from. Even if you have it, use hearing protection to prevent it from getting worse. Use hearing protection when you should. I carry soft plugs for that purpose.
Walker game ears are much cheaper but not perfect. Hearing muffs, with separate controls work in noisy situations. Also good in a blind or when hunting. They are made by Remington and others and found at most sporting goods and online.
Get as much sleep as possible, 8 hrs/nite, and watch the asprin, coffee and medications that make it worse.