Susan
I had the same problem as you. I remember one time it happened while I was playing tennis and my partner said she thought she was going to see my heart burst out of my chest. It scared me silly. It was frequent and unpredictable. I saw 2 cardiologists an internist and a nutritionist. I have to say that the nutritionist helped the most. Of course you don't use caffeine at all, but what is the rest of your diet and exercise program like? Lots of lean protein and minimal carbs and sugars. I walk 4 miles almost every day plus engage in a light weight program. I am 51 years old and have not had an episode in fifteen years since about a month after I started this program - as my doctor had promised. Good luck!