My male chicken is very ill, he is tremendously weak and his body is flat on the floor , his head is resting on the floor, h looks like he has already passed away but i can see he is still breathing as his back is moving up and down. his face previously red is now blackish and his beak keeps and closing. he lost all apatite has not eaten at all and has not drank anything. he has very bad diarrhea and rarely poos. i cant see him this week and so close to death as he is very big but so young what shall i do to save him please help me doe anyone please have any immediate help advice?