You didn't post anything wrong...I was replying to your post made after the vet visit.
Hope you have a safe and fun Fourth of july!
It sounds promising for him, since the vet has seen improvement.
Hopefully, he is stronger than you think and will be able to make the turnaround.
There is a good way to "shower" chams that often won't irritate them.
Here it is, quoted from the forum's Chameleon Care Resources "Water and Humidity" sheet :
Shower - Another method of providing water, especially to dehydrated chameleons, is by using a shower. Place a large plant in the tub, aim the shower head against the wall, and run the water so that only a fine mist reaches the chameleon. The water should be room temperature (not hot!). They may drink for up to 30 minutes. Make sure to supervise your chameleon at all times while using this method.
The full page is here and there are many other great info links on the lefthand side of that page:
https://www.chameleonforums.com/care/water/
I don't know what his enclosure is like but if it has drainage of some sort, you can run a dripper all day onto the leaves to give him plenty more opportunity to drink, in adddition to misting his enclosure.
Hopefully, he has a nice size screened enclosure.
Not knowing how much you already know about good cham care, I'll just add a few more thoughts...
Sometimes chams become ill as a result of their environment not being right for their needs and very often people aren't aware of some very important things, such as not keeping the cage too damp or conversely too dry or the fact that UVB bulbs only emit UVB rays for 6-8 months, even though they still light up so they must be replaced at least twice a year.
That's why the forum moderators wrote this and other caresheets :
https://www.chameleonforums.com/care/caresheets/veiled/
Not replacing UVB bulbs 2x a year actually causes a serious and sometimes life-threatening calcium deficiency because it makes a cham unable to absorb the calcium from its food.
Nutritional problems are a very common cause of illness in chams, as well.
Your cham can't say thank you, so I'll say it again--I'm glad that you've devoted your time and efforts to helping this poor critter.