My 7 m/o silkie-cross is exhibiting signs of infection that's affecting his comb, eyes, and sinus. He's got milky discharge in both eyes, one of which is now closed and mushy looking, and he also has white-yellow patches along his comb that look like pockets of pus? He's also rattling a little and is extremely lethargic. Lost his voice and can't crow anymore. He's been shaking his head a lot. Any way to treat this?