If you have had back pain for 8 years I would go to your Doctor and stamp your feet, and ask for an MRI scan. It could be that you have a slipped disc or similar, which wouldn't show up on an X-ray. You could try seeing a chiropractor rather than an osteopath. Regarding the exercise, I would really recommend swimming. You can do it nice and slow, and you are supported by the weight of the water. It will maybe ease your joints a bit, getting them moving. Also, don't write off a treatment the week after- often you will feel worse for a week, but better in the long run. Also I would try a detox. Muscle and joint pain may not be straightforward- you could get some natural anti-inflammatories like Rose Hip or Devils Claw, and do the Carol Vorderman detox for a few weeks. Very often a food allergy or intolerance can affect your whole body, and eliminating it for a few weeks can make you feel a whole lot better in all respects. It's worth a try anyway!