Hope I am helpful with my story. I have posted before but probably newbies have not seen it. After
many years of symptoms and area gastro and surgeons failing to know what my symptoms could really mean I consulted Mayo Clinic. Even after a CT scan at ER in my Home area, doctors failed to make the connection that an enlarged lymph node in the mesentery which indicated need for biopsy might be something more serious. And all the doctors telling me it was impossible to get to that location to do a biopsy. But it was possible at Mayo Clinic. Turns out my case was Stage IIIB, MENS1, neuroendocrine Carcinoid Cancer. Only found through an exploratory. Three feet of small bowel, 12 tumors and 13 lymph nodes removed. Follow-up every six months bloodwork and yearly scan now at Dana Farber. Had Octreoscan, also Gallium-68 scan now available in America since 2016 previously only in Germany and I believe Switzerland (please google to fact check me). So far cancer free since July 2016. I, too, had nausea, 25 pound weight loss, painful abdominal and back pain, diarrhea. Finally pursued best care ever at Mayo Clinic. They saved my life.