My first thought is, Intestinal blockage. But, if that was it, it wouldn't only hurt "in the morning", it would hurt all the time and especially when you ate. How long have you had this going on? Have you had a bowel movement? Do you have nausea? If you have those two symptoms, I would go to your dr's right away. If it is a blockage, it can be real serious. I've had them twice.
Maybe others have other ideas... (gall bladder? I've never had that, so I don't know what the symptoms are for gall bladder problems)