parasites can cause extreme anxiety, which may mimic arythmia like symptoms. If this is an acute issue, start some serious cleansing and see what happens.
You know your own body. Nobody has ever died of a panic attack, but a serious heart issue is another matter. I have had this so bad when detoxing I thought I would die, but came out of it on the better end, never to have it return, except when the parasites do......