Suffer gastric pain and hunger after 6 hours from taking omeprazole and 550mg naproxen sodium. have been 12 hrs, what to do?

Gi discomfort: it sounds like your stomach may not do well with the anaprox (naproxen) [naproxyn] even if it is given with omeprazole which should protect the stomach lining. I would discontinue taking naproxyn, and try taking some anti-acid for immediate relief. Please see your health care provider for further evaluation.

Gastric pain: Most likely the Naproxen has caused the inflammation of your stomach, you can take some Tums (calcium carbonate) to calm down the pain, also you can take another Omeprazole, don't take Naproxen anymore.