Your vet is whacked! Frankly? if anything happens to your cham I would sue her! I would also report her to your local herp society (where do you live?) and report her to ARAV (Assoc. Reptile and Amphibian Veternarians (see link below).
have you called her and questioned this?? I sure would!! I cannot imagine that this person is an educated licensed vet! I am just furious about this and you should be, too. Damn! I would demand every penny back that you paid to her and tell her you will be reporting her. Even if she see only other types of herps there is NEVER a case where you would give ANY living thing Nolvasan! I would print out the label I linked you to and bring it to her. UGH!
As for your cham...I am not sure what to tell you. I would certainly wash as much as you can off his face, mouth etc. get him to gape or gently force his mouth open to see inside. Find another vet. How does he seem?? here is a link to vets by state www.anapsid.org/vets/index.html
Please keep us updated!!
ARAV
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0.1 veiled - Luna
0.2 green anoles Jaida & Jetta
0.1 brown anole - Jamaica the j sisters were sent to freedom last month
0.2 house geckos - Gaia & Tia (MIA 
0.2 felines - Kyndra and Líta