He got a lot worse, He was vomiting and had the squits, well basically orange liquid exiting his rear at a high pressure

Took to the vet who checked his temp which was fine, his heart was fine, she gave him an ahem examination to which he deposited his diarrhea over her table along with his glands those probably needed expressing with the condition of his poo the last few days.
She mentioned the RC diet which I declined and said I would try the white fish, egg, chicken , pumpkin route .
So far he hasnt had any more of it, despite eating the fish about 2 hours ago. So we shall see.
He is still lethargic and sleeping a lot, least he isnt in pain like he was.
Thanks all.