I got hyperacusis as a complication of my stapedectomy. I know that many people are getting it after this surgery, but it may get better or disappear at all after a couple of weeks, or continue for a much longer time,before your brain adjust to the new reality of hearing. My is still here,with a smallest improvement, after 4 1/2 months. Recently, totally out of desperation, I got a relatively new type of ear plugs called CALMER, made by a British company FlareAudio. It claims to cut not the sound, but rather some high and low frequencies, that makes sound more natural. I have read a lot of patients reviews, most very favorable. To be honest, I have a mixed opinion about this product: sometimes, it seems to be a LITTLE helpful, sometimes not at all. But it worth to try. You risk $25 on Amazon. And it is very small and practically invisible. Just go to Flareaudio.com
Good luck!