Hello hope the answer helps you out.You are having chest pain on and off as you mentioned but kindly let me know nature of it pressing as heaviness or with heart burn as simple benign things as GERD or muscular spasm can present like this provided you donot have any risk factors as DM,HTN and H yperlipedemia.I think you try some oral analgesic with muscle relaxant capsule as parafon after such episode and see the response if its worth.But still having chest pain better at the time of pain episode do an ECG in ANY EMERGENCY and let it be checked.Donot worry if your doctor recommends U/S GB as sometimes vague dyspeptic symptoms can be due to gallstone disease will happy to hear your response sir/madam