My duckling is about six weeks old, and she developed a sickness and I don't know what it is but she is just lying on her stomach with her beak tip resting on the ground and her head weaves just a little bit from left to right. She doesn't notice when I put her in water and when I pick her up she usually struggles and kicks but shes just limp. Its horrible and I'm really worried. SOMEONE PLEASE HELP!!!!