I have a really sick chicken. We are brand new chicken owners and had no idea what was wrong with Henrietta when she was sleeping standing up and lethargic. We went through all the possibilities but disregarded respiratory because we didn't see any physical signs until day 3. We finally realized that her eyes were crusted shut- got them open and could see the snot. The next morning we got Terramycin both for her eyes and to give her a shot. She's had two days of treatment and seems no better. Her breathing is labored and each time she breaths snot comes out of her eyes. She isn't really eating or drinking much and I don't know what to do. I don't want her to suffer if it's just not going to get better. I never thought I'd love these chickens so much. Thank you for your help!