We have two chickens that are 12 weeks old in a separate pan from are the birds until they get a little bigger the Polish and the naked neck were in their coop when my three-year-old son said stick fell on him. When my son took him out of the coop initially when it happened the bird look like he was passed out on deaths door. He slowly came to and got a little stronger and was able to lethargically keep up with another bird. Over time this happened three days ago he has been more lethargic and now he's shaking his head and when I went to go pick him up he was jerking his neck from side to side. It doesn't appear that he has been eating hard to tell though. Where do I start?