Thank you very much for the useful information Chris.
Honestly, at this point i would say that the current symptoms are least likely to be related to your heart and most probably a result of localized muscle spasm, stomach problem (reflux or ulcers) or problems with the joint.
However, as per standard guidelines, any symptom that might be suggestive of a cardiac issue (arrhythmia or circulation problem) should be investigated at earliest, preferably at ER. Having an EKG done at ER will help you rule out that there is nothing seriously wrong and will put your mind at ease.
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