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My b/f has been experiencing back pain at night for 2 years, what tests should he get? - back pain at night

This appears after sleeping for 6 hours or more can be done, it must bother to get up for the pain. His back is good during the day. The doctor said, recommended enough of his muscles and massages. He does not plan to test or anything. My b / f myasthenia Chrone or so. It could be like 10 pounds overweight, have weight in the belly, the rest of his body weak.