Not all gastrointestinal doctors are surgical. If you haven't seen either the surgical reference may be able to tackle both issues. My issues are all, thankfully, diagnosed. I know I have gastritis, migraine, osteoporosis, and thyroid nodules that yearly get scanned. I'm sorry no one can get to the bottom of your suffering. My son and sister have both dealt with things that go undiagnosed. Both of them also have behavioral issues, anxiety and depression. And sometimes illness lies hidden and doctors can only rule out problems by all the tests. Sending prayers. Take care and one day at a time.