Hi, I'm 36, Just Started Doing Kickboxing Lately And Eating

Hi, I'm 36, just started doing kickboxing lately and eating healthy. But in the past week, I have this sudden chest pains. Sometimes they're like pin pricks, or a hand just started crushing my chest, or a huge stake just stabbed my heart. It happens usually when I raise my voice a little louder than usual, I laugh loud, or I get irritated with something. It lasts for about 30 seconds to less than a minute. Out would stop me in mid sentence, I'd have a hard time breathing, then, gone again like nothing happened.