From reading lots of your stories I’ve concluded that fear is at heart of your worries.
Remember it’s only a noise inside your head and it will not kill you or send you mad.
My advice is accept it because there is no present cure or magic wand. The longer you have it , your fear will diminish. I’ve had it really loud now for 30 years.
Some evenings I don’t sleep a wink because I’m vulnerable ( have to take it as can’t occupy my brain in work or stuff. It’s neurones inside the brain that need wiring up
Correctly but as yet nobody knows how to do it. So just say f- - k it I’m not going to let the sound of a boiling kettle ruin my life.