Manton, Is your pain limited just to your back or are experiencing any pain radiating into one or both legs? Any numbness down your legs? Try crossing your legs so that your right ankle is resting on your left knee. Have someone push down on the knee of the crossed leg. Switch legs and repeat. Did that recreate or mimic your pain? Regardless of your answers to the questions above you will be well served to take 800 mg of ibuprofen every 8 hours for several weeks even if you're not having pain when a dose is due. That is, unless you have a stomach condition or kidney problem for which NSAIDs are contraindicated. PM me if you have any questions.