My heart pounded, three times in thirty seconds, I was so scared becau…

My heart pounded, three times in thirty seconds, I was so scared because it wasn't like usual pain, it was way worse, after that there was panic and shaking, has anyone had this? Do I need to call an ambulance if I got hit and it stopped? Could it be from weight gain (20kg)? I was lying down calmly and not worried at that moment.