Avoid coffee and tea...possible causes of your condition is stress,caffeine,nicotine,underlying anxiety....Occasionally heart palpitations can be a sign of a serious problem, such as an overactive
thyroid gland (hyperthyroidism) or an abnormal heart rhythm (arrhythmia). Arrhythmias may include very fast heart rates (tachycardia), unusually slow heart rates (bradycardia) or an irregular heart rhythm....Consult nearest physician they will do the needful.