they're part of the bodies natural fight or flight hormonal response system.
they are a signal from you're brain to the rest of you're body that there's something serious afoot, and its time to satnd up or run like a big jessie.
Whiskey honey i get them myself at the mere thought of someone who shall remain nameless!! they are doing my head in too!! maybe its just to keep reminding you that you are in lurrrrrrrrrrrrrrrrrrrrve!!! haha