My silkie rooster is yawning and shaking his head (in that order.) to the point where he almost fell down. He seems to be eating well and drinking well, he’s about as active as the other chickens. He’s been sneezing some but more in the morning when I’m letting them out of the hen house. When I got him a few days ago he was a little lethargic, closing his eyes some and standing there. But he seems to have perked up some since then. What should I do? Any help would be appreciated, thanks.