The high ANA and RNP does point toward MCTD. Prednisone should give you some immediate relief and then the other drugs used take 2-3 months to kick in. Hope your rheumatologist is a good one, interested in helping you get relief and treatment aiming for control/remission. Thank are lots of helpful people here who will take the time to share and support you. Glad you found us and you will learn a lot from those on the same journey. Strangers helping strangers but a wonderful way to connect and not feel alone and frightened. Stay with us and keep posting your concerns and progress. We are always here and happy to help!