Thank you for your medical query at AskTheDoctor.com
I understand your concern.
This seems to be a posture related muscular back pain. I will advise you a 3-day course of Ibuprofen or you can also apply Diclofenac gel locally. If you take the tablets, the recommended dose is 400 mg twice daily after food, under the care of your physician.
Hope this was helpful,
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