This is currently my main emotional control.

Imagine a small ball in your mind, this ball rests in the center of your emotions where everything is calm. It rests in a small divot, so it doesn't move as easily. Whenever your emotions stray you simply roll the ball back to the center, it only takes a couple seconds. If the emotion is deeper, imagine another ball deeper, going down as many as necessary. If you follow Tantra, this is very similar to aligning your Chakra's.