What I've found to work well when asked with the question, "why are you seeking a second opinion?" i find that doctors totally respect and appreciate the truth....especially if it concerns communication and feeling open/comfortable. besides...quite truthfully, a doctor is like a shoe! it's gotta fit right...or else you don't go very far. (ooh, aren't i the philosopher tonight!)
been through 5 rheummy's. the only downer to seeing another doc, is that they might get lazy and agree too quickly with what the previous doc thinks.
so stick to basics...just bring Xrays, bloodwork, CTs, etc....don't ask for doctors notes/exams or diagnosis.
a fresh start is good...the doc will most likely want to repeat his own labs and tests anyway.
i wish you the very very best & hope this goes smoothly and quickly.