Thanks again, Melissa! 
I heard from my CI surgeon this afternoon via e-mail and he said what I'm experiencing is tinnitus -- not auditory hallucinations since I can't understand what is being said.
He suggested I try sleeping with one CI on, so I'm going to give that a try and see if it helps.
I did ask him about taking Prednisone, but he doesn't feel that it would help and is concerned about the side effects of depression and mood swings exacerbating my bipolar.
