My pekin duck has not been doing so good. I don't know how she would have gotten gapeworm, but she seems to have a lot of the symptoms. She shakes her head, wont eat her food (though she still eats the grass) and seems weaker than my other duck. I don't know what to do! How should I treat her? Could it possibly be something else and I'm just jumping to conclusions? Her voice is very weak and she's lost a lot of weight. I am very concerned for her. She isn't even a year old, only about 10 months max.