Have you actually talked to this guy? Whatever he achieved, I'm sure he would easily give it all up to be even 10% healthier.
Let me tell you. I got a doctorate with debilitating chronic illness and published with hyperacusis. I think about suicide every single day. I would burn my money, burn my degrees, clear my mind of all of my math knowledge, give up math for the rest of my life just for my hyperacusis to improve significantly.
Also, if you're going to preach about mindfulness, maybe actually explain the philosophy correctly. The "it's actually a good thing!" is a well known form of compulsion and thought neutralization that fails. From a book I own on OCD and general intrusive obsessions, the following example drives home my point:
Increased Frequency of Obsessions (Overcoming Obsessive Thoughts, by Purdon & Clark, pg. 43)
When you use neutralizing acts and compulsions, they come to remind you of the obsession, because they are so closely linked with it. For example, Juan [made up name in the book] had obsessions of stabbing his grandchildren and would neutralize these thoughts by constructing vivid mental picture of his grandchildren as healthy, successful adults. In one image, they would be all wearing graduation robes. Whenever Juan saw an article of clothing similar to those that his grandchildren were wearing in his "good" thought, the obsession would immediately come to mind. Unfortunately, when you try to suppress a thought, you actually become extremely sensitive to anything related to the thought, so the thought is easily triggered. Thus, compulsions, neutralizing, and thought control make you overly attend to anything related to the obsession, which in turn triggers the obsession. Hence you experience an increase in the frequency of the obsession.
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What that excerpt is saying is that if tinnitus really bothers you and you try the "positivity" route, what will happen is you will build up frustration and then later become more bothered by the tinnitus. It is never a good idea to try to play free will mental gymnastics. If tinnitus sucks, the best that one can do is truly accept the burden of it. Granted, this obviously still isn't enough, as one can accept something and still live in misery, but the "it's just a sound" way of thinking is incorrect from a behavioral standpoint.
Actually, getting out a piece of paper and writing out one's worst thoughts and observing them, allowing them to feel the anxiety is a lot more effective. This is proven to be effective, by the way.