Hello, Thanks for writing to Health Care magic, I am Dr , Muhammad Ahmad , I have read your question closely, I understand your concern and will be helping you with your health related problem. In my opinion there is nothing to worry about in your case, these symptoms you had were normal, heart beat does get faster with exertion , like in your case stair climbing, specially if one is dehydrated or hasn t been drinking much water that day and exertion is done, heart rate might get much faster. There is nothing to worry about if this problem doesn t get repeating itself. Heart burn is not usually related to heart problem , Your problem seems to be caused by Stomach/gut upset, it needs life style modification before any medication , here is what you need to do. 1) Avoid coffee, caffeine, Fizzy drinks , junk food, smoking, alcohol (What ever is relevant). 2) Take small multiple meals instead of few larger ones. 3) Drink much fluids. 4) Use fruits and vegetables more than meat. 5) Use fiber diet like fruits vegetables whole grain bread and fiber supplements if needed. 6) Stay physically active. 7) If you are over weight reduce it. 8) After trying out all these measure you can use syrup gaviscon thrice a day this will keep a check at your gut PH. 9) I also recommend similar patients to use Omeprazole 40mg once a day to check stomach acid levels. I hope this answered your question, If you have more queries I am happy to answer you. Regards. Dr.Muhammad Ahmad