Shelliebear,
I do commend you on all that you are trying to do for this poor animal. Keep calling the vet and you will evetually get through. Jaybunny is right though, if you can't afford the vet visit then it is seriously time to think about doing what is best for the animal. I know this is heartbreaking to hear, but the snake should be given to someone that has the means and finances to take care of him. I wish you the best of luck though hun!