First, remind yourself to take it easy once in a while. It's never a good idea to procrastinate for hours at a time, especially when you have a lengthy to-do list, but taking a break can help you be more productive throughout your day by resting your mind.
Next, make an effort to associate with your coworkers and laugh. Joke around and lighten up the atmosphere - others will be able to benefit from your efforts as well.
Finally, don't underestimate your surroundings and environment. For example, a messy, unorganized desk can automatically put a damper on your workday and make it more difficult. Arrange your environment accordingly to enhance your working conditions.
If these efforts fail, you might want to consider speaking to your psychic if you're regularly dissatisfied with your job. A psychic chat may reveal that it's in your best interest to change careers.