Aye it’s a right bastard is tinnitus. Had chronic tinnitus in both ears for about 9 years now. 32 years old now. As above – really battled with it for a couple of years and used to really affect me/get me down.. Not sure what “clicked” but I seem to be able to ignore it for the most part nowadays.
Obviously if I’m in a quiet environment I can hear it and have to wear earplugs for loud clubs and motorsport events. I hadn’t heard of the 3D scanning technology for custom plugs – I’ll have a look into that thanks. I have some custom ones from many moons ago (via the old fashioned method) and they’re not a great fit anymore.
My advice (easier said than done) is just to keep yourself busy (mind and body occupied) and try to forget about it. Although it sounds like yours is louder than mine. I have hyperacusis as well, horrible stuff.
As for the cause probably a multitude of things, I was quite close to an aerosol explosion as a lad, lots of loud clubs (abroad is worst due to no one giving a shit about regs), job in heavy manufacturing, motorsport events, etc.