He should see a doctor earlier. If he has developed cirrhosis
of the liver secondary to his hepatitis C
infection, then needs prompt evaluation and treatment to avoid further problems, and control the current ones.
Among the complications of cirrhosis are: "ascites" (which is fluid inside the belly, so i don't know if that is what you mean with a "swollen stomach"); he can get "encephalopathy" (confusion, mood changes, difficulty sleeping); he can get bleeding from the stomach due to "Esophageal varices"; he can get liver cancer
So those are some of the reasons why he should be seen earlier by a doctor.