Mood Swings

I've serious issues when it comes to mood swings. I can be the happiest person on the planet one moment and the smallest annoyance can put me off in an instant. And its not just that they control my emotions, they have a massive affect on my physical life as well. Whether its reading a book, listening to music, writing something, talking or whatever the heck I'm doing, its difficult for my stubborn self to budge unless i'm 'in the zone'. Does that make sense? Its like I'm this self-centred bitch, yet it feels kinda of powerless at times.