I'm so sorry to hear that you are having to deal with that as well as everything else Kitty and really hope you get some answers and feel better soon!!
My nanan had Progressive MS and she had some earing loss, however it wasn't very bad. Her Neurologist examined her and told my mum and grandad that he thought she could have Tinitus (sp?) from all of the medications she was taking as she said she could hear a buzzing/ringing noise in her ears that would come and go. I'm not sure what they did to try and stop these symptoms but from what I believe, my mum said they put her on some medications and then measured her up for an hearing-aid.
I'm sorry that I can't help you that much but just wanted to send you my love and say I hope you feel better real soon as the hearing loss must be very scary for you

! Please talk to your doctor and see what he/she says - it might be something really simple that can be easily treated and I hope and pray it is!
I'm thinking about you and please keep us all updated when you can!