This is my female sweadish blue duck. She's about a year old. Shes always had fresh water and new food. Latley I've noticed she's not talking as much and started sperating from our other sweadish blue. Yesterday she looked like she had a seizure and now sometimes has a hard time standing/getting up. She also isn't eating well but is drinking and has lost a good amount of weight. I put apple cider vinegar in their water. Tonight I has her drink water with brewers yeast in it thinking maybe its a niacin diff? Please help me!