What can be done to stop heart palpitations?

See below: It depends on the exact heart rhythm. Things that tend to make them worse are alcohol, caffeine, lack of rest, stress, and certain medications such as cold medicines or nose drops. Medications are sometimes useful. But they frequently go away by themselves eventually so don't despair. Sometimes you just have to live with them and ignore them. They ususally are not dangerous.

See your doctor: Palpitations usually are a fluttery or pounding feeling in the chest. It can be caused by anything minor, like anxiety, all the way to life threatening abnormalities of the heart beat. You cannot tell how dangerous it is without a medical evaluation.