If it makes you feel better: That (laughing so hard you can't stop or breathe) happens to me all the time. And my brother. And a number of my friends. As far as I'm aware, it's totally natural and probably a good thing (as long as you don't have any severe respiratory issues). |D The hormones probably aren't the direct cause beyond just... making you feel more like yourself so you CAN open up and laugh at everything. Though I'm sure the hormone-induced adolescent case-of-the-sillies doesn't do anything to stop the giggle fits. x3
Side effects may include embarassing situations and drinks coming out of your nose, but other than that there's not much to worry about. Sometimes I feel like I can't breathe, but I've been around for 19 years and haven't suffocated (or gone insane... er, at least not to my knowledge) yet. (o__o)d
Enjoy your newfound tendancy towards hysterical giggle fits! 8D