Yeah, that’s not good. You definitely need a new vet that actually specialize in exotics and know what they’re doing.
You can find some vets close to you here: Association of Reptile and Amphibian Veterinarians.
As mentioned multiple times, a swab is necessary to actually treat it. Otherwise you would be following a treatment plan that might or might not be doing anything, which is a waste and might cause problems.
I guess I just have a good memory, and I read a ton of discussions on here, so I can usually remember a relevant/useful thread and find it with the search function.