One of my chicks (I'd guess about 2-3 weeks old) after a nap has been very lethargic, doesn't react to being touched, and has it's eyes clothed. I thought it might have been sick so I separated him and gave him a bit on antibiotics. Now, he keeping making this upchuck motions as if he were going to throw up and every so often will shake his head. He won't drink or eat. Any ideas on why this is happening or how this might have happened? Any ways to nurse him back to health? I really don't want to lose him so anything will help.