Stage IV stomach cancer but spread to the outside of the colon

My father was diagnosed with stomach cancer back in March. His stomach cancer reacted well to the clinical trial of chemo; however, the tumor on the outside of the colon did not. Since the diagnosis it has mildly enlarged. After all the chemo his body is very depleted. He cannot have any more chemo until he gets stronger the dr said. He is on a tpn because he cannot hold anything down when taken by mouth. He says that he feels so bloated and nothing will go down. It just feels like it sits on his stomach until it decides to come back up. He is fighting and we want to help him as much as possible. How can we help him build his body back up?