One of the best treatments for hyperacusis is retraining therapy thaat uses broadband noise. Tinnitus Retraining Therapy (TRT), that was originally used for treating tinnitus, uses broadband noise to treat hyperacusis. You can also use pink noise to treat hyperacusis. By listening to broadband noise at soft levels for a disciplined amount of time every day, you can re-establish your tolerances to sound.
Another method is Berard Auditory Integration Training. When trying to get treatment, the physician needs to determine the Loudness Discomfort Levels (LDL) so hearing tests (brainstem auditory evoke response) or other types of tests which involve loud noise (MRI) won’t worsen your tolerance to sound. Steroids will treat hyperacusis within 72 hours of the onset of the condition.