Chicken looked larger than normal yesterday, and I chalked it up to gaining weight. Husband noticed today something was off - when I got home to check her out, she was panting, and hunchy. When I picked her up, she "threw up" watery stuff that looked like there may be blood? Back end was pretty poopy with yellow custerdy looking stuff. What is it and how can I fix this? They stopped laying a few weeks ago (I have 7, and they are all 3 years old). TIA!