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Hi. My name is***** Thank you for your question about Tigger. For a young kitten to be sneezing as much as him, he may have a feline viral upper respiratory infection. At this time, it is good that he's eating normal and still playful. Also good that he's not having a lot of discharge. In these cases, a lot of them just need time, their bodies immune system, good nutrition and rest to let them get over it. Some that get really run down and get a lot of purulent discharge get placed on antibiotics for a secondary bacterial infection, but most don't need this. Could there be something up there that is a persistent irritant - nasal foreign body? Could there be a nasal polyp that is there? These are two other considerations that get brought up but aren't common at all. The feline upper respiratory viral infection is the most common.
I wouldn't do any diphenhydramine. The best an owner can do at home is rest, good nutrition, easy access to water, and time. You could bring him into the bathroom when the shower is running to let him breath in the moist, warm air as that can help to soften things in the nasal passage way to facilitate their passing.