Is my pet albino rat sick?

No, I wouldn't say so. My old rat, Celsius, did the exact same thing except she sneezed a bit more then that. I believe it is the pine bedding doing it, because I got her from a store where they use pine, and after she got home with new Carefresh bedding, the sneezing reduced a bit, but never really stopped. But my little Celsius lived quite a normal life span and normal life, and died of a tumor and old age. She was about 4-5. I also had a couple other rats that used to sneeze a lot, and they lives normal health spans as well.