Mishi went through a sneezing spell for a couple of days a while back. I took him to the vet and she said he had a cold - yes, our kitties get colds too. Just keep him warm and comfy (chicken soup?) and pay attention to the sneezes. Mishi laid low for a couple of days and then the cold went away. If it doesn't go away, it might be allergies. A visit to the white coats should set you at ease. Let us know what happens.