Sorry Chuck but this item has been discussed numerous times. Unfortunately a nasty side effect of the Cisplatin can be permanent hearing loss. I am one that despite their warning I suffered permanent high frequency hearing loss. You should have been warned about that from the start. What is normally told the ones getting Cis which is still the main chemo used, is that IF you hear ringing in your ears notify your chemo doc ASAP. Most will then switch you to Carboplatin which is supposed to be just as effective as Cisplatin but without the nasty side effects. I know, don't ask why they just don't use Carbo to begin with but Carbo has never been tested in the volumes that Cis has so that's why I was told they don't. I assume you were given 3 treatments of Cisplatin as opposed to the 6 weekly doses some have started giving. Anyway back to your question. The ringing you hear is the actual damage being done to your ears and to my knowledge there is no reversing it. Get yourself a hearing test to confirm what damage may have already occurred. Problem for all of us is they don't give us a pre Tx hearing test to establish a baseline and of course they won't take our word that we had perfect hearing going in. After you confirm the damage see if your insurance company will spring for hearing aids assuming you need them now.