Talk to Gastroenterologist on Stomach Problem

i am suffering fron stomach problems last one like stomach pain extreme gas chest discomfort blood in stool some time diarrhea and constipation sometime stool look like stiky watery and dark brown in color headache weakness not weight loss but during all these i visted gastroenterologist for these problems they advise me CBC, endoscopy, but nothing wrong with me plz tell me what i have to do