Hi mate
Sorry to hear about your dogs problem, tough times when you as owner want to do anything to get your dog back on track.
We have 5 dogs from 3-7 years old. I can recommend the Vet we are using in Ban Chang.
They have done perfect on our previous problems: Broken front paws and toes. Broken hip and leg. Spitting Cobra.
1 month ago our oldest dog was sick, she was happy, running around, but vomiting more than normal. Her stomach had some kind of fluid and was big. Our vet drained around 3-4L fluids every 3 days for 3 weeks. But most importantly the medication they gave our dog worked and she is even more healthy and active now. Blood tests showed it was a problem with the Liver, so I didn't expect her to survive, but she did.
Not the same symptoms as your dog, but I can recommend our Vet in Ban Chang if you dont mind a 30-40min drive.
Best of luck