I wanted to update everyone on this because it's a REALLY upsetting affliction.
I CONTINUE to see general improvements to tinnitus. I get the feeling the hyperacusis is calming too.
I talked about this to my neurologist. I told her how uncomfortable I was playing my acoustic grand piano these days (yeah, I know, spoilt brat that I am). I asked her about using ear plugs. She emphatically said 'NO!' Basically you have to challenge the system so it calms down. The gain in your ear is centrally controlled so playing what you now perceive as slightly loud music is probably a good thing so as to train your ear and brain to turn down the gain again.
I'm going to follow her advice and report back!