A peacemaker of the heart is basically a battery in your heart to help it work and pump. It is not really a battery but it is something like a battery to help your heart when your heart starts declining..
You would probably suffered a heart attack, and the coronary artery that supplies the heart with blood would have got damaged, and so parts of the heart will no longer pump as well as they did...
Yes. Your heart has another heart. Well not exactly but it is a bone that moves to pump your heart. That's why when you run the bone shakes and your heart races faster.