Hi, I have had heart palpitations before but they have become regular in the last 3-4 weeks (they now happen daily several - multiple times a day), however in the last 36 hours a severe tightness in my chest has developed too. My throat feels like I need to cough sometimes and the palpitations feel like my heartbeats are tripping over one another with a big thud to the chest that makes me lose my breath. The left side of my back and my left arm have been throbbing lately too and I can feel my heartbeat really well at the bottom of my throat. I'm 25, female, non smoker, non drinker, I exercise (not everyday), I'm not overweight and I barely drink coffee anymore. Should I go to my doctor or is the heatwave we're having have anything to do with this? My chest is feeling really quite tight right now.