I am panicking this morning because one of my chickens keeps her beak open (almost like trying to throw up), has wobbling walk and doesnt seem like interested in drinking water. I checked her crop in the morning, and it did seem hard. She is keeping her beak really open as I can see her back of throat. Is this sour crop or gape worm or something else ? Anything I can do immediately to start addressing it ? Appreciate help.