A couple of my girls have recently developed severely swollen looking eyes, some are lethargic and many have a runny light brown poop. I adopted what turned out to be Battery Chickens. (https://www.backyardchickens.com/t/906378/are-we-rir/10#post_13853664) Since they have come production out of my previous 10 has dropped until now none of my Chickens in the same coop are laying, and 3 have died. I treated for worms and am not sure what to do now. Are all these symptoms related?