I really feel for snakes that are kept by people who unfortunately cannot provide proper care and attention should they need it, it one of the main things to take into consideration upon owning a snake that you can provide vetinarian care should it be required. Its worth introducing yourself to your nearest Vet and letting them know what you have etc so that you at least have some form of communication going with them. They may be more leniant in times of need then as well (eg) allow you more flexibility for payment plans etc.
I may seem harsh here I am just voicing my 1st reaction and I am not saying you are a bad owner, you obviously want to look after your snake but often these kind of instances lead to problems for the snake and it goes untreated for longer than it should otherwise.
I agree with mlededee anything other than minnor should have a vet looking at tbh. I think most vets would allow you to pay it up have you asked if you can do that ?
If your snake gets an infection and goes untreated you talking even more vet bills and could be fatal to your snake if left too long.
Please look at the enclosure with a view to making it a safe environment, perhaps you could stock up on newspaper next time you are somewhere you can get some.
I hope the wee fella gets sorted out ok, you should keep an eye on humidity as well.
Good Luck hope all works out.