It can be very hard to know what's going on with a chicken.Yesterday we trimmed the best we could around his eyes, but when I get home from school I will work on that some more, along with getting pictures of his feet and legs. I will have someone at home that is able to give him the nutri drench and use the Vet Rx on him.
This morning he was laying almost all the way on his side and my mom said that his feet were cold...is there a chance that may be a sign of something?
He is still alert and although he isn’t clucking, he still will move his head and look at you. He also still shows signs of having an appetite.
It's possible that he may be suffering from disease like Marek's, usually the cause of decline is not known until you lose them and have a necropsy performed.
Are all the lice dead now that you treated him?