Hello, Welcome to Health Care Magic. Thanks for writing. I am Dr.Saddiq ul Abidin. I have read your question completely, I understand your concern and will try to help you in best way possible. It would have been more appropriate if we had known the nature of your pain, its character, aggravating and relieving factors because in diagnosing a cardiac event, most important thing is history. If it is sharp, localized, pointing, pleuritic (changing with inspiration) or positional, it is less likely to be cardiac. If you are not a diabetic, then symptoms of an acute cardiac ischemia are difficult to be masked like this. Also you have referred towards your gastric ulcer, so i have got an impression that you are aware of a gastric diagnosis, so essentially it fulfills all the criteria to fit in, into an ulcer pain. Though your high BP points towards a risk factor towards cardiac events, but that could also have rosed secondary to the pain and discomfort. Same goes as an explanation towards your sinus tachycardia. The automatic readers on EKG machines are quite vulnerable to misinterpretations, as EKG behaves quite differently from person to person, But majority of health workers including doctors and EKG technicians are trained enough not to miss an acute cardiac infarction. If it has been seen by majority them and they have reassured you well, it would be because of some convinving reason. For further reassurance,you could have asked for cardiac enzymes to rule out myocardial involvement. I would also recommend you to have detailed cardiac evaluation after you get stable from gastric pains, and plan an OHS with a gastroentrologist to rule out bleeding. Also stay vigilant for signs like black stools or postural hypotension and giddiness or shortness of breath. Hope you get a speedy recovery. I hope this answered your question.If you have more queries I am happy to answer. Otherwise rate before closing the discussion Regrads. Dr.Saddiq ul Abidin M.B.B.S(Licensed Family Physician)