This might explain why your hyperacusis is still a problem after one year. You might consider experimenting with protecting your ears.
After 9 months with a combination of not going out/ protecting my ears in certain situations and exposing them to moderate level of noise i had a 50% improvment... i also gave up music.....it would be very easy to protect them 24/7 but i dont think thats the way forward.... i just was stupid and had a very bad setback...