If its on the right side it could be an indication of gallstones. I had them, nasty little things. Started out with what felt like bad indigestion. Had this on and off for months then one night it got so bad I needed the doctor. Had a few more bad pains over a period of weeks and ultimately had an ultrasound scan when they found them. Always caused me a problem after eating spicy or fatty food. Not nice at all. Not trying to scare you but I wish Id had it diagnosed sooner and got the medication. Worth mentioning when you see your GP. Hope you soon feel better.