Find a new vet.

www.arav.org can help. Check the member directory.

Your current vet is not competent to treat reptiles...there's no excuse for telling someone to turn temperatures down when an animal may be ill. Low temperatures will make it harder for a reptile to fight infection.

Your BP should have a hot spot of 90F or very slightly higher, and the rest of the cage should be 80 to 83F.