If you don't have the money, humanly put the animal to sleep.
This is past the stage of getting better.
I've dealt with prolapses' in ferrets before, but only if maybe...1/4 of an inch has come out. Usually it is in babies who are on dry kibble, because they can't process it. All I did was keep their bum lubed up, BUT, since the tissue is starting to change colors, that means there is lack of blood supply and the tissue is dying.