I have a 8 month old Ameraucana Mix Pullet, I love her very much. When I went to visit them this morning she was lethargic, head hanging down in her vomit. I took her instead near the heat, and gave her some water + oatmeal mix to rehydrate her. She was completely fine yesterday and I know I take good care of my chickens. I only have 5. The other ones seemed fine. Ive been talking to vets all day, some say it could be infection, but can't give me any antibiotics what soever, some tell me its maybe the heart of the lungs.. I dont know what to do to help her. I've been looking for help all day. Can someone help me?