Hi there. I am a 31 year old female, 5 7 and 180 lb. I just had the sensation of my heart flopping around in my chest for maybe 30 seconds. I felt as if my breathing had changed somehow, but I was not panting or hyperventilating. I tried to call for my husband, but I could not. Afterward, an odd sensation lingered in my upper torso and arms. My heart rate was normal. There was no pain, but it was one of the scariest things. Now I am scared to go to bed. The only history that I think is relevant is a twice repaired patent ductus arteriosis as an infant. And I am also taking natural progesterone cream to balance my hormones. Is this likely just an arrhythmia that can be checked at my doctor s office tomorrow? I don t think I just had a heart attack, but I am worried.