Hello... There are so many causes of chest pain. It depends on age, character of pain. any aggravating or relieving factors, associated with other symptoms, underlying any disorders and many more conditions. Your description is incomplete regarding chest pain. In spite of that, after reading your details i can conclude your chest pain like: sharp pricking type of pain in left side of chest, mild to moderate type, intermittent in nature, non radiating, aggravating on deep breathing and subsided automatically within few minutes not associated with any other symptoms like diphoresis, sweating, gaseous distension of abdomen, palpitation, nausea or vomiting. According to above type of chest pain, it is very non specific related to heart. So in my opinion not to worry regarding your chest pain if you are thinking it is related to heart. But, to find out the exact cause of chest pain, you have to go for some tests like ECG, Chest Xray, and some other tests according to your symptoms. Meanwhile you can take some analgesics like Ibuprofen along with some antacids like Omeperazole. Thank You