I am sorry he's having problems. If you observe severe bloat (very tight abdomen, obvious pain), this is an emergency situation and you should see the vet asap.
What is his diet? Does he get a lot of exercise? Exercise can help move gas through the digestive system.
He is more or less the same tonight but taking his Critical Care and water well. He is maybe slightly more active but still quite lethargic. Going to go pick up some Pedialyte tonight.