Pleurisy is one serious concern. Pleurisy is an inflammation of the lining of the lungs causing pain usually felt first in the right anterior chest wall. The pain may then spread or may be completely reffered to the shoulder or back. The pain is usually sharp and worse with breath and movement. The pain results from the inflammation and friction of pleural surfaces. It generally starts in the right anterior chest wall, over the site of the inflammation.
If a large amount of fluid accumulates, it may separate the pleural layers, so the chest pain disappears, leaving only the shoulder pain.
The course of pleurisy depends an it's underlying causes, but left untreated can by itself cause serious complications.
All things considered you would not be over reacting or wasting your time to see your Doctor. Few problems, persisting several weeks rarely just resolve on their own and you will be left wondering when you will have another episode.
Please let me know if this helps, or you have more questions for me.
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