The high calcium would suggest bone degradation, which can be caused by Myeloma. The back pain could be due to a fracture in one of your vertebrae. Your doctor/GP should send you for an x-ray. If there is a fracture and you have no clear explanation for it, such as some trauma, (car crash, falling from height etc,) then the GP needs to explain how it could have happened. It is another pointer to having Myeloma and he needs to refer you to a consultant at haematology/oncology hospital.
