I love this post from Leo at Zen Habits called, The Cure for What Ails You:How to Beat the Misery of Discontentment. Check it out.
Whether we are happy, fulfilled, at peace - content - is in our control and we can change in an instant. Sure there are truly tragic events that will rock our worlds, and rightly so, for a time. But many of us feel discontent in the absence of tragedy or setback. Sometimes we let a dullness take over our daily existence and become numb to the wonders of our life.
I feel this way several times a day. And I have to catch myself and snap back out of it and get refocused on what matters or unfocused and relaxed. My wonderful cat, Paris, just came to see me so I will go and enjoy her.