I have the same high pitch hearing loss and ringing. It was explained to me that cysplatin was one of the most aggressive chemo's and then I was asked if I was willing to take the chance with my hearing for the benefit of the aggressiveness. I was. I already had high pitch hearing loss and ringing in my ears. It doubled with two chemo treatments and the audiologist said it would triple with the third. I couldn't get the third due to low blood counts.The ringing can be annoying but I don't pay much attention to the hearing loss. My voice level hearing was actually outstanding so I do ok with conversations. Good Luck.