Pasey, the Gas-X could be causing the constipation. Pain meds also do that. The doctors put me on Miralax, which is a fiber. However, it's usually not strong enough for me so I use an herbal remedy and sometimes magnesium citrate (which they usually end up giving me in the hospital when nothing else works.) I think you need to speak to your doctor about both the gas problem and the constipation. Your rock-hard stomach and abdominal pain could just be from constipation.