sick flock!! I NEED HELP

[DPC poultry]

i noticed that my hens are laying just one egg a day for the last three days and i usualy get nine, this morning i went to my coop and all og my hens and one roo are making wierd cough/ half cluck noises. im going out to town in about an hour and i need to know what kind of medicine do get and where to get it. can anyone help me?

 

[wcah]

My hens have been like that now for a week, i rang the guy i bought them off and was told could be due to the change in the weather from beeing warm and dry to cold and wet and might just have a cold? hes said leave them and see what happens. It didnt feel right so after reading the web I put garlic cloves in there water and went to the farm supplies shop and they recommended that i worm them which i have now done, and they dont seem much better. iv booked one in to the vets monday so i will let you know what they say after searching the web i found this http://edis.ifas.ufl.edu/ps044
which gives symptoms and treatment of chicken illnesses and i think it could be Infectious Bronchitis all the symptoms except the runny eyes, and the decrees in food. I will let you know what happens Monday