I have had today and yesterday, a very fast heartbeat over 130 beats per minute whilst at rest. This lasted 30 minutes previously and 2 hours today, I did call an ambulance yesterday and the ECG and blood pressure was clear but my heart was very fast for no reason. They stated it was a suggestion that it was anxiety or stress, but anyone who knows me knows that I am the most carefree person around so this is not right and it has happened again today. Firstly, being dizzy whilst sitting down and then a rapid heartbeat, followed by tightness of chest and dry mouth and then shaking or involuntary twitches. Is this something you would know about, should I arrange a different test?