One of my turkey hens had the same symptoms. I tried several things but what ended up getting her better was was worming with Wazine. Also I gave her Poultry Nutri- Drench (purchased at TSC) the day before worming and the day after. She was back to eating the next day and alot more active. Thought for sure she was not going to make it. Now she is back to normal. Don't know if this is whats wrong with yours but could be worth a try. Hope he gets better!