Please help! I have a six month old Pekin drake who has been sick for almost 24 hours. When we found him, he was standing over his water bowl with his penis extended. It did not retract for about 4 hours. It has now retracted, but he is lethargic and has greenish diarrhea. He's not eating a lot but is drinking water. He will get up and walk around for a little bit then sits down. Any suggestions?