There's a really good chameleon vet in Fairfax that I highly recommend. I'll get you his info.
Stahl Exotic Animal Veterinary Services
4105 Rust Rd.
Fairfax VA.22030
703 281 3750
Dr Stahl and his staff are excellent. Several members here have use Dr. Stahl for many years including one Parsonii keeper.
If you can't get to him you can call around and check out these reptile vets. I'm not sure which ones are good with chameleon except Brad Waffa and he just moved to NC.
http://thereptilereport.com/virginia-reptile-veterinary-directory/