Hi Hun,
Sorry you are in pain. When I get belly ache I lie on the floor, on my back, knees bent and pull my tummy in. Then massage your tummy in a kind of 'kneeding' circular motion. If its trapped wind, trust me it will help to release it (found this out in the most embarrasing way in a yoga class....nearly demolished a wall!!)....if its what you have eaten, it will help to get it moving. You can also pull your knees up to your chest and hold them there.. Also mint tea always helps me.
Hope you feel better soon.
XXX