Since your current treatment with a muscle relaxant and topical diclofenac is not providing relief after 10 days, you should consult a doctor for a proper evaluation. Your doctor might consider switching you to alternative oral nonsteroidal anti-inflammatory drugs (NSAIDs) like naproxen or aceclofenac, possibly combined with a different muscle relaxant like thiocolchicoside. If the pain is severe, a short course of paracetamol combined with tramadol may be prescribed. Please avoid self-medicating further, as a physical examination is important to safely pinpoint the cause of your pain and prescribe the correct therapy.