I get strange heart palpitations (center side of chest) when in certain positions, as if my heart gets electroshocked, for example when suddenly raising my hand up or bending left side.its uncomfortable and makes me feel sick after.what can this be?

Strange symptoms: First, be certain that these symptoms are indeed emanating from the heart & are true palpitations. One would check the pulse to see whether it's irregular or rapid at the time of symptoms. Otherwise you'd need to have an EKG at the time of symptoms or wear an outpatient Holter Monitor for 1or 2 days to record heart activity when you note these symptoms. You may instead be having ribcage pinches.