One of my 6 golden comets (2 yrs old) is sick....... They are molting, so they all look sad but she seems to be sneezing or coughing. She looks really weak although she is eating and drinking. I let them free range while I clean their coop and she wants to lay down in the yard and seems disoriented. From my search here, I'm thinking her problem may be respiratory. What drug should I use?