Thank you for your response. I did take my cat to the vet and they did an X-Ray and found a large qty of fluid in his abdomen. Blood work showed a high potassium level and his electrolytes were out of whack. He went in for a sonogram today and they found his body riddled with tumors. He seemed perfectly normal a few days ago and I can't believe how quick all of this happened.
Please take your cat to the vet ASAP. A distended abdomen could signify many things, such as a urinary blockage, pancreatitis, Gastrointestinal foreign body or more. These can be medical emergencies, and are also quite painful.
Cats who are anorexic and who don't eat for ANY reason can develop hepatic lipidosis (fatty liver disease) which can be life threatening on it's own.