My tinnitus and hyperacusis were significant for quite a while. Both symptoms have lessened a lot as I've recovered (over 2+ years). The tinnitus is still there, but at a low (or non-existent) level most of the time. For the most part I now find these symptoms inconsequential.

I still put in earplugs in noisy / overstimulating situations, which seems to help with whatever remains of these symptoms. I think gradually re-introducing exposure to normal noise levels and a range of sounds helped me adapt. That, and all the other good PCS-recovery habits, including keeping stress low as much as possible.