I have experienced heart palpitations in the past few years and I have been admittedly stressed and anxious. However, the palpitations have changed in the last week or so. Now they are 3 or 4 very strong beats that I can feel and that take my breath away and then it's back to normal. It is very disconcerting. I almost feel as if my heart is beating an extra time or two and that it takes a second to go back to normal. Should I be really concerned. BTW, I am overweight but my recent blood levels showed an enviable cholesterol level and all my other levels were normal. I don't think I have ever had a thyroid test though.