My husband has grapefruit size tumor in color, started to invade stomach, they took 1/2 stomach, over have large intestine, few inches of small intestine, and gall bladder because of large stone. That was 3 weeks ago. He still has ng tube because fluid is still suctioning. But the colors are different, at different times. What do they mean? They said still waiting for stomach to "wake up". Is this common?