It`s high time you went for some basic investigations like Hb, TLC
, DLC, ESR
, AEC, Sputum test-gram stain and ZN stain and a chest x ray
. The pain could be because of laryngotracheobronchitis or it could be pneumonia
or could be because of excessive coughing. If all tests are normal, take a course of antibiotics, some pain killer and cough syrup after consulting your GP. If tests show up anything you may either post them on HCM or go to your GP.