Please Help

Hello, I have been having some vague abdominal symptoms that started 8 years back, just started as feeling of pulling sensation of intestine, flatulance immediately after pulling, slowly started getting abdominal pain not localized but in general, generalized weakness, loss of weight gain, frequent slight fever. Blood work, x-ray, ultrasound and barium swallow came out as normal. Doctors says there is no problem, but I have a lot of stomach symptoms. Found no relief on antacids, like gelusil, rantac, cimetadine, omez or any antibiotics. Some doctors said it is just stress, some say maybe it is ulcer, some say polycystic ovarian disease and it will resolve on its own, some say the duct in pancreas is not funcitoning well. I am just confused, someone please help. If anyone have any idea, kindly help me out. Regards.