I have a 3-year old bantam, Esmeralda, who has been losing a lot of weight recently. I noticed this weight loss about ten days ago, and so I gave her Valbazen, assuming that worms were the problem. She was acting fine, just thin--the only odd behavior that I noticed was that she was drinking a ton of water. No signs of worms in her poop. Fast forward to Monday, she started acting lethargic. She didn't want to eat blueberries (her favorite) but when I offered her some cooked egg she ate it with some enthusiasm. I gave her electrolytes and probiotics, but she didn't really improve. The next day she was acting the same, and I dewormed her again, this time with Wazine. Now, 24 hours later, she is still lethargic. She drinks A LOT but doesn't want to eat, no matter what I offer her. I have been regularly giving her electrolytes and probiotics through a syringe. TL;DR: -Three years old, Old English game bantam -She does not seem to have an impacted/sour crop, it is large in the evening and small in the morning, and her breath is not foul. -Her poop is basically water with a little bit of brown and white stuff in it, nothing solid. I have cleaned her vent thrice now, it keeps getting dirty. -She has not laid an egg in about a week and a half -Most of the time she stands up with her head tucked in and her eyes closed. -She is very thin. She ate yesterday but refuses food today. -She is very thirsty, and has been drinking a lot of water, to the point that she throws up sometimes (when she bends down, the water comes back up). -I have been giving her cooked egg, electrolytes, and probiotics daily. She also ate some cat food. What do I do? I've dewormed her twice recently, and I also dewormed the entire flock in September (with Valbazen). I have not seen worms expelled in any droppings. She is breathing just fine, no wheezing or anything, no discharge. She is just lethargic, very thin, and her droppings are very runny. She wanted to eat yesterday and the day before, but not today. At this point I have no clue what my options are, other than putting her down. If it's not worms, what is it? All of my other hens seem fine, no signs of illness whatsoever.