Tell me why

Life is so simple and cool when only your mind is working. Then something or someone comes along, stirs up a whirlwind of emotions, and then everything becomes so incredibly complex. Why are emotions so bloody difficult to deal with? Why doesn't one ever know what's going to hit you? And how the hell do you figure out what's going on? And how do I get my brain to take control and tell my feelings, emotions and all other crap to just fuck off?