Jennie, if your doc hasn't done any testing, go in with a request to have some done. Make sure you get some standard blood tests done and then consider asking for a colonoscopy. I know it's something that most people avoid, but when you have alternating bowel habits and pain that is radiating, you need to get this checked out. If you haven't changed a lot - diet, added or taken away meds, haven't been sick, etc - it's time to be more proactive.
Please read 'Nissen-fundol...pain" comments on this page. It applies to you too.