Hello I share your concern Looking at your description tightness in chest with coughing could be caused be number of diseases like Heart disease which can be ruled out by ECG and echocardiography Lung disease like bronchitis or inflammation of airway and lung tissue Another possibility is Acid peptic disease or acid reflux, your history also suggestive of this. In my opinion you should follow these guidelines Take pantoprazole or omeprazole with antacids for 5 to 7th us Don t lie down immediately after food Have small and frequent meals, avoid overeating. Steam inhalation complete bed rest until diagnosis confirmed and rules out heart disease If you can provide me more information like your age and relevant medical history , I will be able to tell you even more precisely. wish you good health