Was listening to one of our local vets on the radio. They are very aware of pain and management. They appreciate trigger pain and prescribe all sorts of treatmets for the animal, including hydrotherapy. They also give glucosamine for joint pain, and because they can see an improvement in an animal, it is accepted that it works.
Glucosamine was stopped as a prescription drug for humans because there was not enough evidence that it actually helped humans.
Maybe the next professional I will discuss pain management with will be a vet. They do seem much more advanced and understand pain better, from animals who can't describe anything, but just appear better in themselves.