I've had it for nearly 20 years, and I know it came from an incident shooting firearms with not enough (none) protection. Most days I don't think about it anymore. However if I am tired or stressed, it seems to turn up to 11. I've read many people get depressed or they can't get over it, luckily I seem to deal with it alright, but wouldn't wish it on anyone. Protect your hearing!
Ive had almost the exsct same experience. I dropped 100+ rounds through my mosin one day stupidly without hearing protetcion, and have been listening to my electric crickets ever since. It isnt distracting at this point but would be nice to turn off eventually.