antibiotics fromt eh vet probably Baytril.. its prob sinus or upper respiratory infection.. possibly fungus but prob the other. The meds you tried may have worked partially on some but they really need reg antibiotics.
YOuc an try a local Vet school at a University, local chicken farmers or farmers raising chickens.. call your feed mill and ask if they know anyone, also hatcheries in your area? they all may have meds on hand or be able to suggest a Vet who treats birds.
Keep in mind birds hide illness they are Masters of disguise and by the time they actually show symptoms the illness is sually well underway and time is an issue so I wouldnot wait too long on it.
GOod luck