From your description, the pain appears to be of musculoskeletal origin. Did you hurt yourself ever during the recent because the loud pop you are mentioning could be trapped air in the soft tissue
which is released on movement-a condition called subcutaneous emphysema
which is generally a benign condition. However i suggest that you get at least a x ray
chest done which may reveal any lung pathology or even a bony lesion if present. You may consult a pulmonologist
who can examine you and advise you accordingly.