Oh gosh, that is heart breaking. I actually had to go to the Vet after hours last week with my old boy due to him crying in pain, so I know how terrible it is to hear them cry. The vet thought my dog was having back pain and so far the meds have worked but I am going to follow up with a neuro. Listening to my old dog for only 30 minutes, I can't imagine having to listen to a dog longer than that. I just don't have the heart. I hope they can find some relief for your girl.
Just curious but why didn't the vet give you pain medication?