You also may want to consider taking 400-500mg oral magnesium. Magnesium deficiencies are almost always associated with heart ailments. Magnesium aids in relaxing muscle, including cardia and lung, and thus reduces spasms. My palpitations have been significantly reduced after taking it for 3 mos. It may indeed be parasites, but sometimes we shouldn't blame them for everything, otherwise we lose focus on other things to try.