I had that about a month ago. I was under an insane amount of stress from school and other things. It went away after a week. I also was experiencing a shortness of breath every 10 minutes or so. If it lasted any longer I would have went to the hospital. I do have heart problems. I have prolonged QT waves. Related? Maybe. Concerned? Not yet. It went away.

I'm 19 if that matters any.