If your heart is beating fast, try to stay calm. Sit or lie down and take slow, deep breaths. Avoid caffeine, nicotine, and alcohol as they can increase heart rate. Loosen any tight clothing. If possible, measure your heart rate. If the fast heart rate persists or is accompanied by chest pain, dizziness, or shortness of breath, seek medical attention immediately. In some cases, medications may be prescribed to control heart rate. Regular exercise, a healthy diet, and stress management can also help keep your heart rate in a normal range. ????