Sounds like an Internal Medicine Specialist might be your best bet.
I understand your frustration, my dog with environmental allergies is stable now x 4 years. But, I went to 3-4 vets in a 1 year period before I found a specialist that did the allergy skin testing, diagnosed, and prescribed a treatment that works.
The first step is to get a diagnosis, then evaluate your treatment options (imo)
PS: The initial testing is the worst of it ($)
But, we now only see the specialist once a year.
Other than routine care (annual heartworm test) we have not had to go to the regular vet.
Also, I would hesitate to give this dog any vaccines if she is not medically stable.
