Abdominal Pain, Diarrhoea, Headache, Shoulder Pain, Weight Loss. Endoscopy, CT, MRI, CBC, Pancreas, Liver Tests Done. Reason?

I m a 49 yr old female and was having abdominal pain at top of stomach between ribs and breast bone pain rt of sternum. Also had diarrhea with green and yellow stools, lightheadedness , headache in rt eye, shoulderblade pain that wouldnt subside. Recently had endoscopy, ct of chest, MRI of brain and spine , CBC, pancreas and liver enzymes and all came back clear. I have also been experiencing burning of the tongue and an irritating fuzzy feeling in cheat and chills but no fever. The MRI did show a trace of mastoiditis. My concern is weight loss. I have lost 9 lbs over the 10 weeks. My doctors say they fel they have done so many tests and they have all come back good so they don t know what to think. Do you have suggestions?