There are many things that cause irregular heart beat or palpitations. I've been awakened by them so I understand how you feel. I'm sure your doctor will find out what they are and hopefully offer you some help. Sometimes, taking beta blockers will help greatly with this condition. They are not a cure but they do help a lot by lowering your heart rate. I'm discovering that many people have similar problems so it's not really uncommon though when these things happen to us, they become large in our minds. That's human nature. Let us know what the results of your tests are.