Dont listen to the ones that tell you that you WILL die from a heart attack
..A person may..but it's not a certainty. There are several mitigating factors. Do you have high blood pressure? Do you have a family history of cardiac problems of any sort? And the pain..you say it was severe..was is crushing? was it sharp and stabbing? Not all gall bladder
attacks radiate to the back..and not all heart attacks do either. Are you male or female? What is your age? Honestly, nobody on here can tell you whether or not the pain is or IS NOT cardiac in origin.
I would strongly suggest if the pain continues and you have any of the symptoms or existing conditions I mentioned above, call your physician or go to your local ER.