Fran
                    
                    
                    
                    
                    
                    
                    
                        
                        
                        I too suffered from severe back pain for several years.  After countless trips to many doctors I finally found one who gave me a complete blood workup. He found I have pernicious anemia. I take shots twice a month and am no longer plagued by back pain. This might be worth looking into. Good luck.