Irregular heartbeat and rapid heart rate. feels like someone's hand is squeezing around my heart. 24/f/obese many dr trips say all is ok but worried?

Any testing?: Given the feeling of heart beat irregularity, depending on how often this happens, your best bet (if not already done) would be to wear an event recorder. It's a heart monitor that you can wear for upwards of a month. With this, we can capture these sensations as you're experiencing them and see what the heart is doing at that moment.