I used to have Hyperacusis, the best you can do is not to avoid noise (other than harmful levels of course). i had so bad that even the slightest noise was torture, it lasted about 6 month before the problem faded.
In the case you got it really bad try TRT. (please google)
Be assured, hyperacusis is in almost all cases not permanent.
If you live in Northern California you may want to contact Dr. Sweetow at UCSF, he is a top Audiologist and very knowledgeable about hyperacusis.
... You hit the jackpot, very few people have experienced this disorder.
luckily it will be faint memory you in a while...