I was also going to suggest Tufts,I am rather surprised to hear they don't treat "exotics"
are you sure you called the right number,
on their website they say they treat exotics, its a vet school, with vet students,it would seem odd if they didn't .
not trying to argue, but I have been there many times and have seen many types of animals come thru
my beagle spent some time in the ICU so I spent a lot of time visiting
http://www.tufts.edu/vet/fhsa/clinical_services/exotics.html