hello, as you have chronic back pain you need to be investigated for slipped disc or sciatica. you might need to be done ct scan of spine if your xray turns out normal. you can take painkillers and apply ointment to alleviate the problem of pain. you can do some back exercises you can be shown by the physiotherapist. apply hot packs before you go to sleep it will give alot of relief. avoid lifting heavy objects and bending alot try to sit properly with your back aligned to the chair use firm mattress when sleeping hope to have helped answer your query wish you a quick recovery.