So everybody is searching for happiness. (this is a given) However, a certain amount of misery is necessary to provide impetus to get to a sustainable version of happiness, eg, contentment. However, being too happy can lead to lower lows than usual, so it's important to temper expectations. Anyways, the great search for happiness may be as unhealthy as an extended depression. Newsweek posts an article on the downside of being too happy, and not enough moderation.
http://www.newsweek.com/id/107569