thanks for asking your question i completely understand your problem actually in this young age most common causes for your complaints is peptic ulcer/ gastritis. so don t have much of oily,spicy food . you can have a proton pump inhibitor like pantoprazole before meals for a couple of days. u should consult a pulmonologist / gastroenterologist who can get a chest X-ray done and other investigations needed to come to a diagnosis. is you smoke first thing you should do is quit smoking from now onwards thanks/regards feel free to ask more questions may god bless you with good health