Yikes! Sorry to hear about your cham, that's a vet to avoid at all costs.
I don't have any "reptile/exotic" vets near me, they're all 2+ hours out. The one "exotic" vet guy that so many people recommended me to take my one male panther to was a total nut job. Charged me $80 to just look at him, and tell me after 5 seconds that he had "fungus" and it was my terrible husbandry. He didn't take any samples to send off to a lab, look under a microscope... NOTHING. He gave me (well, I paid dearly for it) silver sulfadiazine cream to put on all his spots (they were all over his body). After 5 months I started doing more research, and his spots turned to hard growths. We suspected (we meaning my NEW vet I've been using) papilloma, we did a full biopsy and removed 6 of the growths and after a histopath, it was papilloma.
Just because a "vet" claims to have experience with exotic animals, doesn't mean jack to me now. I didn't care for how he handled my cham (he wasn't super rough, but just acted careless), and I felt sick giving him $120 for that crappy visit. I went to a few local/state based reptile groups asking if anyone knew of any good vets to use, and NOT Dr. blow-smoke-up-my-butt-and-charges-outrageously guy, and someone gave me the name of the vet I have now. She doesn't have the schooling for exotics, but she doesn't jump the gun on treating my animals. She knows basic worms/parasite stuff.... But like when it came time to see about removing his papilloma spots, she went and researched, and got on some special vet-only forum and reached out asking for help. Those vets gave her advice, and for $150 Chief got 6 spots removed, a definite answer for what was wrong, and a happy owner. I couldn't have done this without asking my local reptile enthusiasts. Find a local rep group and ask them for vet names.
Good luck