Grace,
Believe me, you aren't alone and yes, palpitations can be frightening. Try to take comfort knowing the doctors have told you they are just PVCs and won't hurt you. I have had them since I was a kid (I'll be 51 in a couple of weeks) and have learned to ignore them. It's not unusual to not feel them at all as many people have them and don't feel them. It's also possible to have them seemingly non-stop. They feel weird, but won't hurt you. The less thought you give them, the less you'll likely have or feel them.