The main first step is to try and identify the triggers for your palpitations; for example, do they occur when you’re tired, when you’re not sleeping enough, or when you’ve been drinking too much coffee? These are very common triggers for palpitations; by eliminating any triggers (if possible), you should notice your palpitations beginning to improve.
Secondly, you can perform certain manoeuvres and breathing exercises, such as the Valsalva manoeuvre (where the patient blows into a syringe whilst lying down, face up, for 15 seconds), which change the pressure inside the chest cavity and can be effective at stopping your palpitations, particularly if they are persistent. It is important, however, not to ignore your palpitations if you are concerned and to get them assessed by a GP or cardiologist.