Any coughing or sneezing? If he is making odd breathing noises he may have come down with a respiratory disease. Often they need antibiotic's to get them through it. Antibiotic's won't cure the disease itself but it will prevent the bird from developing a secondary infection which is often what takes them out. I went through a respiratory bug with my rooster, he also showed a darker comb while he was sick. I took him to my avian vet who prescribed Baytril. We also kept him in a large dog crate at night with a heat lamp since it was Dec. and below freezing at night.
Good luck with your boy, it's hard to see them not feeling well. Do you have an avian or exotic's vet nearby that could see him?
