If you can get the Di-Methox, Sulfamed G, or Albon (all same drug) get that. If not try the Corid for cocci. How does his crop feel--is is swollen or flat? These would be at any feed store.
Do you have any antibiotics or any Corid you could start him on tonight? He may have cocci or her he may have something else, but I would either give him Corid or Duramycin10. If you could get some Sulfadimethoxine (Di-Methox) it would do both to treat the cocci and some other infection. You...