[anonymous]

An endoscopy may not be necessary. The examining vet will advise you accordingly.

PS: Your vet must have someone covering for her? Your dog’s. records are available to all that work at the clinic. So the covering vet should be able to help you. It fact, it may not hurt to get another opinion.
Your dog is on prescribed medication and the symptoms continue. That’s a good reason to give the clinic a call and see what they suggest.