It sounds like the vet you went to was very misinformed. I would recommend looking for a new vet with actual chameleon experience. Perhaps send a PM to a more experienced chameleon owner from texas, such as "texas panther man" or "texas ranger" just to name a couple. These members have been working with chameleons for a long time and I'm sure have had to use a vet, they probably can point you in the right direction.