Hello and thanks for trusting me to help you. I am a board certified consultant with over 30 years of experience.
I understand your concern.
Well as you describe,chances of lung cancer are nil in your case.
However other possible causes may include Costochondritis(inflammation of the junctions where the upper ribs join the cartilage that attaches them to the breastbone),Muscloskeletal pain,chest infection,Gastroesophageal acid reflux.
You should try some self care measures like
Also do gentle massage with muscle relaxant ointment on affected area.
Also take OTC Prilosec and Motrin.
Hydrate yourself with plenty of fluids.
You should avoid passive smoking if possible for a while.
Avoid alcohol,caffeinated beverages,spicy,fried food.
Cover your mouth with mask while outside.
Take OTC Claritin.
If your symptoms'll persist then see your doctor for chest auscultation,chest X-ray,blood work for further evaluation and management.
Let me know if you have any further query so we can discuss it thoroughly in every aspect.
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