I'm constantly lost in a maze bronsoneggbeater, but I always find may way out when I need to... You said that vets are difficult to find in Toowoomba - I beg to differ. ANY vet will be able to choose a path for diagnosis and treatment, pathology procedures vary little between species, so biopsy (if needed) would probably be the first step to solving your big mystery.
As has been said already, vets unfamiliar with reptiles will communicate (telephones, email, internet... more artefacts of the modern world which help with those living in remote situations... a vet can even send photos via email - amazing...) if you can't find a herp-experienced vet.
Jamie