Ay, ang heartburn usually parang burning sensation na umakyat from your stomach up to your chest and throat, kaya "heartburn" ang tawag, pero hindi talaga sa puso yun, acid reflux lang! What you're describing sounds like it could be heartburn, pero since you're getting that tightness feeling, mas maganda talaga i-check mo with your doctor para sure, lalo na kung recurring na siya at nag-aaffect sa daily life mo, kasi may ibang conditions pa na may similar symptoms.