have you any aggravating factor like after taking meal or relieved after defecation or in empty stomach?
any history of passage of loose stool ?
the pain may be due to chronic calculus cholecystitis
,PUD,non ulcer dyspepsia or some form of malabsorption
you may take pantoprazole 20 mg 12 hourly.
if it is progressing then go for an USG or consult a gastroenterologist