Jessica, I recommend you reading about Epicurus and specially his book "About happiness". I'm not sure what type he was, but definitely Delta NF.

Risking spoiling it, I will just say excitement doesn't really make you happy. Excitement is an unstable state, impossible to maintain for long. Unreal. And the more you become addicted to the "highs", the more harshly you will experience the "lows". Emotions are chemicals within the brain, identical to any commercial drug.

True happiness is a state of serenity, where nothing hurts or bothers you. And even if he didn't said it explicitly, Epicurus was thus probably the first person to realize the true importance of a dual in our lives. Only those who have experienced such serenity can claim being truly happy.