First I'd like to give my thoughts to your little sister, I hope she is doing well and staying strong. Second, the PVCs: for me they are induced by stress and strong emotions as it seems like you are under. When I can feel them occurring what helps me the most as cheesy as it sounds it really does help to take deep breaths in through the nose and out through the mouth as well as lay down and try to take a break from the situation. I know the laying down thing is difficult most of the time, but the breathing really seems to slow the heart rate down and take away the stress and as I call them "off-beats." Your cardiologist doesn't see medication necessary for the PVCs?