Sorry to hear about the Sleep Apnoea and hearing problems. I suspect the two are not connected, but who knows. I suffer from tinnitus as most of us getting older are prone to. Usually you can just ignore it, as if it is constant, the brain just tunes out non varying inputs, but I know some people can't do his and it can drive you crazy.
There are some treatments for tinnitus, but I never found much of benefit, things may have changed since I retired.
All I would emphasise is avoiding noise exposure, like a loud concert. It will worsen established tinnitus and make it more likely you will get it. If you experience temporary tinnitus after a gig, you have permanently degraded your hearing.
As for getting older, I've just had my first bout of gout. If I was a horse, they'd put me down. I'm sure my family are tempted by the thought.