I have had 3 hens die in the past 4 weeks. They all acted the same. They would just stand in the corner by them selfs. Eat and drink just a little bit. Or they would just lay down. I am a first time chicken owner. Not to sure what to do. We were told to give them shots of b12. And om3 pills. So we did that. We r deworming them now. We are also giving them electrolytes. Not sure what is going on?