Last night I laughted for 2 hours. but not for good reasons. I have never heard of this before. My PD said it was just as well crying. but I could not stop, it hurt soo bad, it still hurts today. I tried to explain it to some other people and they could not understand it was not a good thing,the laughing. It was so scarry to not be able to stop. It feaked out my hubby, he could tell I was trying to stop. We called an alert team and they new what it was and how to help. They had me get in a hot shower for about 20 min. I could not breath good and passed out couple times. DOC said treat it like a panic attack. Any one heard of this??