How do I treat a chicken that had a stroke?

My 4 year old silkie rooster has been healthy his whole life and is usually agressive towards people besides me. He usually eats and drinks well and even though hes the smallest rooster he was the top of the pecking order. Lately hes been acting funny and his head and neck have been tilted almost sideways. I've done some other research and it seems like he has had a stroke. hes still drinking but he will sit in the yard and not move, and he kind of cant see food when i put it in front of him. Should I just put him down or can I treat him at all? He is still out with the rest of the flock but I will be seperating him soon