I have a rooster that is about 2 yrs old. He's a mixed breed rhode island red and something. About 3 mos. ago he was very sick. Wouldn't lift his head and was drooling. I nursed him back to health with antibiotics, hand feeding and using a syringe with water for his drinking. Since his illness he will not crow and seems to be short of breath. He is wheezing and sneezing. I need help. I'm very attached to him and am afraid he is getting sick again. I give him vitamins in his water and he is isolated from the other chickens.