It sounds like you need to start corrid. I would assume it is form of cocci. Start treatment and get these guys in the sun. Keep them out of drafts. Chickens do not do well with out, fresh air, places to run, and the sun on there face. I never recommend using any type of drug, but, it sounds like you are going to loose them all if you don't. The corrid will treat tummy issues and lack of eating. The sun will take care of the stargazing.