I need help fast. One dead hen, one lethargic decreased appetite, shaking her head, with a green diarrhea. Now all of my other hens are shaking their heads and I am noticing diarrhea in the coop. They are 8 months old, large breed (barred rocks, orpingtons, etc). I need help fast, I don't want anyone else to die. Have to treat myself. No vets in the area deal with chickens.