Large Reptile Cages

It has been nearly a month and a half since the last time my snake ate. He shed recently so thats not the issue. He was also transfered to a larger cage because he last one was to small, (could a cage being to small effect a snakes eating patterns?). He is not showing any signs of deterioration in health. Other then the fact that he won't eat he is healthy, he is active. What do I do, it is hard to find a vet that deals with reptiles im my area.