I'm almost at the end of my tether. Not sure how much longer I can keep him alive without thinking he might be in too much stress/pain.
Current symptoms: Gaping, extending neck, can't use his legs to support himself and now pretty much lying down.
I took him to a vet specialising in poultry. I took a stool sample and she looked at it under the microscope and found that he had coccidiosis. She gave me a drug called Baycox for that and also something called Hydrodoxx for his gasping. He didn't like the journey much (only 6 miles) and when he arrived he was just lying down, although seemed to perk up a bit when he was moved when at the vet's.
He is eating fairly well and drinking, but I'm not holding out much hope. I know I've done absolutely everything I can for the little man, and if he doesn't make any progress 8 hours from now, I am going to give him the chop. Hate to do it, but for the sake of the most probable discomfort he's going though, it's the humane way I think.
So that's my update thus far. I will repost in 8 hours or so with the conclusion. However rubbish the outcome....