Please consult your family doctor for ECG and full evaluation

First and foremost you must understand quiting smoking is a very gradual process. You should have strong determination and patience if you want to quit....and medications can't be prescribed just like that...de addition is a multi step procedure... you need to undergo counselling sessions to get motivated....The benefits of quitting smoking are extraordinary. Once you're tobacco-free, your risks of heart disease, lung disease and cancer begin to drop even if you've been smoking for years...I would suggest you to consult nearest pulmonologist for clinical examination and pulmonary function tests...if everything normal then pain may be due to gastritis....try eating several small meals instead of three large ones whenever you can...Avoid foods that irritate your stomach, especially those that are spicy, acidic, fried or fatty... avoid coffee,tea etc... Avoid stress,consider calming activities, such as meditation, yoga etc...sleep with head raised position and have dinner at least 2 hours before sleep..take over pantoprazole 40 mg twice daily before food with above for 15 days....Regards.