How do you think it is not painful to have your rectum hanging out of your body and for the flesh to start dying????
ALL animals are programmed to not show pain as a defense mechanism. Most animals who eventually start showing pain or symptoms of being sick, are often so sick or so damaged that it is too late for them.
Put this animal to sleep if you can't find someone to help. Most vet places have special credit cards only for vet charges, but if you don't want to do that, put this one to sleep.
Yes snakes are cheap and easy to take care of, but they are still an animal, and just like people, freak accidents and events happen that can cost a lot of money, or cost the life of the animal.