For a more informed opinion (rather than guesswork), can you get a co-worker to film your daily exploits so as to examine your work habits/posture etc?
(Might be something simple, like the wrong type of footwear).
What is your history of injury/activity?
Is the pain related to upper or lower back, is it symmetric, or located to one side or the other?
Is it constant throughout the day, or does something set it off partway through?
Can you describe the pain?
If you can fully articulate the problem, a professional, or the internet, has a better chance of helping.