Get an ECG done it can happen in congestive cardiac failure, gastritis,certain lung diseases...so detalied evaluation and examination is necessary...Consult nearest physician they will do the needful.... And 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 pantaprazole 40 mg twice daily before food with above for 15 days....