I just experienced an episode that I get every so often. My heart increases in beating, my throat feels like there is a lump on both sides, my forehead becomes warm and sweaty, and I feel very weak. I am currently dealing with blood clots in my entire left leg, the result of a knee replacement two years ago. About a year ago, a clot travelled to my lungs and it required a hospital stay for three days. I am on xarelto. About 10 years ago I had an episode of my heart beating 250 bpm and was in ICU. It took almost 18 hours for it to return to normal. This recent episode took about five minutes to return to normal.