I have tinnitus in both ears and was at a point in my life where the anxiety it caused was overwhelming. Doctor said it would be about $4000 for tinnitus maskers, which I could not afford. It obviously was never going away so I decided to lean into it and I would lay in the bath for 30 minutes or so with my ears underwater where the sound was most deafening. This way, I couldn't escape the noise. I had to hear it. Eventually, I learned to accept the sound and my brain habituated it. I still hear it, but I no longer get anxiety or stress when I notice it. Maybe this can help him.
Those earrings look familiar
They are like hearing aids, compact and not really noticeable. They play fractal tones into your ears to "mask" the ringing. I got to try them for a free trial and they did work but they were definitely too expensive.