> An audiologist friend told me to go to an ENT physician if not better by 48 hours or the damage could be permanent. Much longer than that and it would be too late to try any of the interventions This seems like poor advice. If there is significant, realistic concern about permanent damage, I'd suggest checking immediately, rather than give it extra time...
Yes, I always find it amazing how patients can have a sudden sensorineural hearing loss and wait days before presenting. In my opinion patients and the public should treat it as urgently as a sudden sight loss. High dose steroids are regularly prescribed in this sort of scenario in an attempt to minimize damage, and are likely to be more effective the sooner they are given.
Having gone to the physician with complaints many times and be told to wait to see if the issue goes away (most of them didn't) or that there's nothing to be done about it, one is quickly trained not to bother going to a physician for anything short of a major injury.
(And this behavior is from a physician who is a Ph.D at a teaching hospital, no less.)