Does the doctor feel the amount you are eating and drinking is abnormal? Going to the bathroom frequently after a lot of drinking is probably not uncommon. And are you also talking about bowel movements after eating?
Hello~Have you been under an abnormal amount of stress? This can sometimes cause what you are experiencing. What were your blood sugar levels? Did he do an A1C? I am just curious because your symptoms do sound blood sugar related, but then again, the body is a strange (but marvelous) machine, so it could very well be something else.