A. Poor kitty sounds like he has upper airway infection that sounds as though it may be caused by what is called a nasopharyngeal polyp (a round sac of tissue that spontaneously forms in cats especially bad causes unilateral/one sided ear and nasal infection).
A vet should have at your kitty tot take a look inside the ear if they also suspect this may be the cause.
Another possibility would two separate disease processes that are just occurring at the same time, particularly a viral infection of the airway and an ear infection (caused by mites, bacteria or yeast).
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