I'm not sure what the consequences are if left untreated, but I remember the vet telling me that the worms will lay eggs, and that they could possibily spread to other snakes that are in the same cage. Until you can have your snake checked out by a vet, the only thing that I can suggest is to isolate the snake and visually inspect any feeder fish that you give it. If the fish are infected, you should be able to see the worms just under their skin. Just to note: I never had this problem with feeder goldfish, it was only with feeder guppies.