With your syptoms and positive RNP sounds to me like you like are having a autoimmiune flare for sure. Look at all of your blood tests closely. If your CK and CRP levels are really high your Doc should be putting you on Prednisone or Medrol right away. I am pulling for you, this a tough journey. If you are not getting the right answers keep changing Doc`s until you find one that really wants to help. Unfortunately, you have to be your own best friend and advocate to get to the truth. Don`t give up!