Is it important? Hell yes, we spend more time at work than anything else, we should be happy at work.
According to this article, there are a few thing to do to be happy at office
1. Choose to be happy. While brushing your teeth or shaving, look at the mirror at tell yourself that you will be happy today.
2. Find something you love to do and do it once a day. It can be something outside of the office, such as a hobby or something. How about pick up cycling and join me on my ride? Chess? PS3? Stay away from alcohol and drugs, please. Other vice as well. :)
3. Remind yourself that you can choose your own destiny and path your career takes. Learn a new skill that will take you to your chosen career.
Making any sense? Message me.