Structure your business more effectively. (Score 2, Insightful)

This is a business level issue, not one specifically with your job.

I believe your best option would be to talk to your management about putting processes in place to allow you to more effectively handle your work load and communicate with the rest of the people in the office.

If the staff in the business have proper expectations set regarding how your function within the business is performed, by having procedures for both parties to follow, they'll then have to take up their issues with management, not you, as I would think should normally be the case.