As long as one just actively tries
not to think about it, the brain will be focused on the thing it's supposed to avoid. This is because there is an active thought fixated on T (=trying not to notice it). So at least for me, it really doesn't work. So tell your brain what to do instead: distract it in positive ways and eventually, allow T to exist. For some using masking sounds that completely erase the T noise doesn't work, but for me it was a lifesaver when I was really anxious. Just not allowing myself to hear it and managing my anxiety instead. Then when I didn't feel hopeless anymore (I had my routine of putting pleasant masking noise whenever T sound would bother me), I started to decrease the volume of masking.
Then the next step was to allow and accept the noise - I can't decide not to notice it, so I can listen to it and little by little accept it. T doesn't cause pain, it doesn't mean something is fatally wrong etc. This is hard and it's something I still need to work on. When the sound becomes neutral (we allow it, we don't fight it), then the brain stops obsessing about it and eventually it will fade into background more and more. One very good piece of advice that helped me in starting this, was that whenever you find yourself listening and analyzing your T, change the perspective a bit. Instead of obsessing about the loudness and whether it is better/worse, just tell yourself how you
feel about it. So "my T is really loud today, is that a new sound?!" changes into "I am anxious about my T today, I need to find a way to calm myself down a bit". This kind of helps to take control & action... We can't directly change T volume, but we can alter our reaction to it.
And when it comes to calming down, the best methods vary a lot from one individual to another. What are the things you enjoy
@Elfin ? Which activities make you feel good? For me it is escapism by playing video games, listening to music, eating healthy & delicious food or doing some light yoga exercises. These things make me feel better and when I comfort myself with them, it feels like I am not allowing T to stop me from enjoying all things. Acute anxiety/panic is another thing and it is really tricky to control. Whenever you feel like anxiety is swallowing you, stop and think this: what is the tiniest, smallest thing you can do to make yourself feel better? Is it a warm cup of tea to root you back or just lying on floor listening to certain music? Big steps can seem impossible when one's really anxious/depressed, so I find it easier to start with something small, when in the middle of it.
Hope this helps, even a little bit.