It does sound muscular to me, have you tried ibuprophen, sorry if it's not spelt correctly. They are muscle relaxants as well as pain killers. Speak to a Pharmacist, I ususally take them as the full dose for a few days. Try gentle stretches & nice walks as well, not too much slouching on the sofa. If it lasts more than a few days see the doc.
How high in your back is it? Pain below the shoulder blade can be a symptom of stomach problems. My ex had it and went to the doctor and was found to have helicobacter pylori - a bacteria that causes stomach ulcers. My friend had the same pain a few years later but ignored me when I told her to go to the dr - she now has an ulcer.
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