Back pain & lack of sleep. Physician!

For God's sake, someone help me with the said problem. I have consulted two orthopedic surgeons from a reputed hospitals and one physician regarding my back pain and insomnia problem. Everyone said that it is because of lack of physical activity and gave some pain killer which never worked. I have been visiting doctors from last 3 months for the same problem. I was given with vitamin supplements after testing the blood and finding vitamin deficiency. Kindly understand that I cannot keep switching the doctors and get the same input from everyone. I'm confused now whether to consult a orthopedic or general physician for this problem. Whomever I meet recommend certain things and never bother to diagnose the problem further to check if it is actually a bone or muscular or nerves problem.. No scanning done yet. Why don't doctors understand that the problem might be because of any other reason and recommend the right doctor to consult. I have been suffering this from 6 months. Kindly suggest