We have a hen with a very similar condition. I have posted about her a couple of times. She started out clumsy and has slowly gotten worse. She sits on her rear, has trouble walking, falls frequently, poor weight., does not eat well. Her feathers are usually scraggly too, from falling in water or dirt. It took us a while before we noticed that she was falling; she does not always do it. She is just a young hen. She is not throwing up as yours is, though, but has a lot of the same symptoms. Her toes don't necessarily curl, but she seems to have a problem gripping. She cannot fly, but can use her wings some. She is not laying. We have been treating her with high potency vitamins, first polyvisol, and now a vitamin mixture we got from our avian vet. We have consulted with several people about her, including Peter Brown, the chicken doctor, but we have not taken her for a vet visit. The general consensus is that it seems to be a vitamin deficiency, not Marek's. The vitamins seem to help, but she will improve for a while, then decline again. We are going to try high dose antibiotics for a while, because ours is starting to develop a stuffy nose and seems to have a problem swallowing. There are lots of look alike conditions, but I thought you'd like to know, cause there are a lot of similarities here. Please keep us up to date about your hen, and I will do the same, if it helps yours.
