Phone the vet and ask him/her. Every vet is different. Don't worry about cost. If you have a sick snake, fix it. The snake didn't ask to be in your care in your cage in your home.
And MANY things can be the cause of your problem. No one is psychic here, so how can we tell/diagnose your snake and provide any useful solutions. Next time post pics of the snake and the setup. Basically, what you posted is the same as me coming here saying my car won't run properly, what should I do? LOL! Impossible to even know where to begin!