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Hi and thanks for query,
You are most probably having a pinched nerve in your back which usually do not respond to painkillers, what were findings in your MRI?. Do you ever had any trauma to your back? I would suggest the best option or you is to visit pain physician as soon as possible for thorough examination and diagnosis. He might offer you steroid epidural injection which helps alot in nerve problems.
Let me know if you have further questions.
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Wish you good health.