Hi Terry,
I also have constant humming in my ears and my ENT said the same thing, that it is a possible side effect of the chemo (cisplatin) that I had. He, too, said that there is nothing that can be done. I just hit my 1 year mark since completing treatments and the humming is still there. I've sort of gotten use to it except those times when it's really loud. I just wish it would start playing a different tune!
Take care,
Nancy