A swollen restum are is not normal. Also this is not heat or heat pad related and heat will not solve it .
Find a vet who keeps their own snakes. Otherwise you will find lots of vets who say they specialize in reptiles. But they really don't. they just go in the back and read up on whatever. When the snake dies they are not liable and took you money. Which is most likely the case here.
They will charge you for fecal exams to see what parasites there are. Then the meds they will give the snake probably will kill it or make the snake suffer for an extended persion and then dies..
Save you money unless you can take it to a vet with REAL experince in reptiles. Don't beleive what their receptionists says either.
I don't know what state you are in but call some large scale reptile breeder near you and ask them which vet they use. Do some detective work finding out who (if any) large breeders are in you area. That is the ticket to finding a good vet.
otherwise I would overnight the snake to a vet who does know about snakes. There are a handful around the country and shipping them a snake is something they are used to.
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