May I suggest some Tylan? Broad spectrum antibiotic, pop the dosage in some water and syringe gently on tip of the tongue. I'm in the UK where it's prescription only but I believe that it's available "over the counter" in other countries. It's my "go to" for most minor chicken problems until I can get them to a vet. Good thing is that he's eating, always helps when they have a will to live. Best of luck and fingers crossed for you.
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