I find this technique is good for healing abdomneal aches and pains, and matters of the stomach.
Close your eyes and place your hands so that the tip of your right thumb touches the tip of your left thum and the tip of your right index finger touches the tip of your left index finger, forming a triangular shape, over the area that is causing the pain.
Take deep breaths, breathing in with the nose and out through the mouth, the same you would as preparing for meditation and clear your mind, thinking not of the pain and discomrot, you want to get your body to relax, and visulize it relaxing, by visulizting the energy just flowing through your body and expelling all inpurities.
As you do this you should also open the Sacral Chakra, the Chakra just over the navel, as this well aide the healing.