I.R.
my suggestion is at least try some ear plugs used to muffle sounds and if that helps, give him some time to adjust, like a month, if the problem persist, I would look into the possibility that he has a sensory process defect, the problem with this diagnosis is that it does not exist in a medical text book, but physical therapists and occupational therapist use this term and thus there lies a problem, many physicians can not make the diagnosis if there is no reference to it in texts and also in the diagnosis coding books. There also lies the problem of no diagnosis, no known treatment.