Thanks for your question on Healthcare Magic. I can understand your concern. In my opinion, we should definitely rule out lung infection in your case because you re have developed chest pain and worsening cough. So get done chest x ray. If this is normal then no need to worry for lung infection. Possibility of musculoskeletal pain is more likely due to coughing. So take levocetrizine 5 mg twice daily for coughing. Apply warm water pad on affected areas of chest. Take simple painkiller like paracetamol or ibuprofen. Avoid movements causing pain. You will mostly improve with all these in 5 days. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.