Hi. Your posting additional symptoms would have helped me to give you a better idea about diagnosis. Viz: nausea / vomiting/ abdominal distention / constipation or loose motions/ fever/ fainting or collapsing / sweating/ and so on. If these symptoms are not there , it is less probably due to pancreatitis. Large stomach hernia can cause this type of pain if the opening ( neck) is small and there is entrapment of intestines. If one goes for an X-ray in standing lateral position , one can see intestine being trapped. Such a simple test. Ultrasonography and serum lipase and amylase enzymes increase in pancreatitis. Well there still can be another reasons , which can be diagnosed on a good clinical examination and your proper history. Let me know more .