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It is likely that what you are experiencing is a nerve pain because of a pinched nerve, arthritis, sleeping in the wrong position, due to medication, or a heart attack (less likely given that its been lasting this long, however should not be overlooked). Given that the pain is so intense I would recommend being seen by a doctor as soon as possible to rule these causes out. You will require a good physical exam, imaging, pain medications. In the meantime you can try rest, ice, and elevation to see if that relieves it any.