I have been having what my doctor has called palpitations for the past month, i.e. my heart has been racing unpleasantly. She suggested thyroid or anameia and I have had blood tests, am awaiting the results. Also I had an ECG which is said to show nothing untoward. I am 66 years old and female and I am concerned about the experience of heart racing. I feel as if I am anxious, frightened, and yet I know I'm not. Sometimes these effects last over half an hour, and sometimes eating sweet things sets it off.