perhaps its time to see a Pain Management Center
I have found that working with experienced Pain Management doctors will ensure your pain is controlled, allowing you a better quality of life. If you are lucky, they will ensure your ability to keep working. Unfortunately, most GPs are uncomfortable – and uneducated – in the various types, dosages and combinations of pain medications that will keep you on your feet. I have found a need to change my medicaitons, including type and dose (and combinations thereof) as my symptoms change. Hope this helps.