So we got a new rooster from our feed store and when i brought him home he immediately became withdrawn and quiet. He still ate and drank but had discharge on his beak and nose and sounded gurgley when he breathed. He stopped crowing completely. I wiped his face off each day and gave him fresh food and water and for a few days I thought for sure he was going to die bc he could barely hold his head up. Then a few days later he started crowing again. Now he still had a slight gurgle noise and when he crows it sounds like he's lost his voice. My feed store says none of their chickens are sick so they have no idea what could be wrong . He is still eating and drinking but I'd like to get him feeling better so I can put him with my ladies finally. Is there a vitamin or supplement I could give him??