I have pain in the left side of my body in my major joints, shoulder, elbow, hip and knee. Can you tell me why?

See details. No one can tell you exactly why without being able to do a physical exam. See your doctor or a rheumatologist and find out why.
No. No, it would certainly take a more detailed history, physical exam, likely followed by appropriate testing to determine the cause. I would not hesitate to be seen for it.