I've had the same pain for the last month. My Chiropractor friend thinks it might be my Ileo-Cecal Valve. Here is a quick link www.energybalancing.com/selfeval/ileocecal . I did a quick google search for this link.
Mine hurts right now. I was sitting here massaging the area when I cam across this topic. I personally feel like there is a sore in my cecum...