My dog keeps sneezing, help me!?

my dog is little chihuahua, and from saturaday she keeps snezzing, i dont know what to do! i want to go to the vet,but they say its �30 pounds for a check up, and i dont have enough money, what should i do, i dont want my dog getting ill, he has never done that before, its just constant snezzing and its really worrying me, HELP PLEASE