My 1 year old chicken has had inexplicable symptoms for a few months now. She keeps shaking her head over and over and again. Click here to see a video: Additionally, she has no appetite and has lost a lot of weight over the past few months She is not eggbound. She has been treated with Coccid with no improvement in her condition She does not have mites/ticks/fleas There have been no new birds introduced to the flock since her symptoms. We live far, far away from any other poultry Her crop is empty (she hardly eats) She just sits there, listless and without energy and no appetite. She doesn't do her normal activities and is always laying down and it is so unlike her. I've ruled out sour crop because her crop is sadly empty most of the time and it feels normal to the touch. Her stool is completely normal with no sign of parasites. She has only had contact with wild birds and I wonder if they could have passed something on to her. What could be causing this, and what medication can I give her to treat this? Please help me save my beloved feathered friend!