Barb,
I don't have a specific doctor to recommend at Johns Hopkins for your problems. They have a very strong rheumatology department as do places like Mayos, Cleveland Clinic and Northwestern. The only doctors I know at JH specialize in myositis diseases and probably would not be the ones you see.
In my case I had 2 suburban (Chicago) rheumys, an internist, a hemotologist, and a 3rd rheumy from Northwestern to unravel my puzzle and treat me. Sometimes it takes more than one to diagnose and treat these difficult diseases. As for letting you doctor not see your past records I do NOT recommend that. Give them every advantage of seeing all the tests and records. When I enlisted the doctor from Northwestern I sent him about 80 pages of records. He called for a lot more tests as well but it saves time and sometimes there is a clue in the past records that earlier doctors have overlooked.
Hope you can get answers soon.
Bill