I Was Diagnosed With MCTD Years Ago, Followed Up With

I was diagnosed with MCTD years ago, followed up with a rheumatologist that said my issues weren't a rheumatology issue and to follow back up with my primary care doc... I went several years with tolerable symptoms, but recently( past couple months) symptoms have been uncontrollable so I followed up with another rheumotologist, is it possible that he will change the diagnosis... RNP IS POS ANA is neg