anxiety disorders can cause many different symptoms which can make you feel as if your heart is out of whack. also stomach problems (ingestion) can too.. if you feel as if the fluttering is causing you to be scared about your heart please seek medical attention from a cardiologist and get an EKG done which than u can be able to find out if your heart is okay.
You would be surprised at how common this is. I had that too in my late 20s to early 30s. I want you to read the following post. It has some great advise and info for you.
Take care, Ally
i agree with your doctor ,,stomach acids can do more than that believe me ,,anyway the best test for you to be sure is take a walk for a 15 min ,,if you dont feel dizziness or tired then there is nothing to worry about it