Is there an agricultural college anywhere near you? That might be the only place that would know about chicken physiology and illnesses. A few years ago, my pet chicken Crystal became ill; I finally found a local vet who would x-ray her and he found that she had swallowed a safety pin and some needles. I ended up taking her to the state university veterinary college, where she had a laproscopic procedure and eventual abdominal surgery. Even at the veterinary school, it was the first time they had done the procedures and surgery on a hen! A year later, my next pet chicken Sheila Marie started limping and I took her to the same local vet. He found that she had arthritis and a hairline fracture of her hip. I had to give her injections for pain every day.
I hope you can find help for Treacle. Chickens are wonderful pets.
Before you criticize someone, you should walk a mile in his shoes. That way, when you criticize him, you're a mile away and you have his shoes.