I have no idea what your problem is, but half way through reading it, my conclusion was that you may have hyperacusis. Then I saw, in the next paragraph or two that you mention it.

Hyperacusis and tinnitus are both mysteries to the medical community. They may be caused by over exposure to noise, over time or suddenly.

I have tinnitus, and have had it for decades. It sounds like crickets, but on occasion is a hum. I try to mentally turn it into something positive. Sometimes a song works. I always liked the sound of crickets at night at our family cabin when I was a kid, so those crickets don't bother me.

I also find that rhythmic breathing helps me when I'm stressed. Have you ever practiced any stress management and relaxation strategies?