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Hi this is Dr Stan here to help you today. These symptoms could be related to your heart even though you had a "normal" electrocardiogram. You will need further cardiac testing including a stress test and echocardiogram at the least. There may be other reasons for your symptoms, but heart related problems could be deadly. Schedule an appointment today to have the additional tests performed. Should you have another episode of chest tightness/pain call 911 or go to the closest hospital emergency department. I hope this is helpful. I am activating the rating page and a positive rating is always appreciated.