There has been alot of changes in the last 2 weeks (lost one and got 2 new chicks). My hens seem stressed. One is going through an early, very heavy molt. They seem disinterested in their feed but will free range quite a bit. They were just treated for roundworms. Their stools fluctuate between loose and hard. Not sure if it's the weather or the roundworms. I've never had chickens act this strange. Can stress do this or is it a sign of illness?