Heart palpitations making me feel very uneasy, had it for a whole day now. what can i do to get rid of them ? what's causing it?

Need a monitor: Palpitations (or the sensation of fast heart beating) could be related to a genuine rhythm abnormality or the cause could be simple skipping . So first of all we need to find out and document what the heart rhythm is during the feeling of palpitation, and the best tool for that is a cardiac event monitor. Obviously further recommendations could follow based on the results.