Ok, here's the truth.
I've kept numerous reptiles over multiple decades. Not including the ones I kept during the 15 yrs I worked in pet stores. I've kept chameleons nearly my entire life. All that being said, I don't think yours is going to make it based on those photos. It's bad, very bad, once any species of Cham has the over all appearance yours does in those photos.
Losing a chameleon hurts. Hurts me, hurts just about anybody who uses these forums. I've been in your shoes is my point. I don't think he'll be here in 24-48 hours. I am sorry to say that.
So lets learn from it? Been my motto a long time.
Start with the temps, the animal seems to have been kept a bit hot. Ideal temps for most chams is a basking area around 85-88 and the rest of the cage dropping to the 70's during the day. That is only a possible problem/cause of your little fellow's problems.
Humidity should flux a bit. High humidity with low air circulation tends to cause a respiratory infection. I am not sure if that is what happened, but it gives you something to analyze and think on. Usually for a veiled a drip is enough to take care of their needs. Personally my animals have a slow drip available to them for hours in the morning and another later around 5pm. Hydration is not an issue that way.
It is very easy to overdose chameleons with multivitamins. Personally I use a multivitamin supplement once a week on two food items. Another day I use Repashy calcium w/ medium D3 on a few food items, the other 5 days I use straight calcium only. I also feed my food insects fresh veggies.
I do not use liquid supplements unless an animal is ill and even then only if the animal is not taking normal dusted food items.
Chams are one of the few types of reptiles where you can almost always count on having at least one sick one out of any number you ever own. As such you need a qualified reptile vet, not a vet who says they will see reptiles but a vet who specializes with them. You can find a list on this site if I recall.
Handling your Cham 3 times a day, never a great idea as most chams by their nature do not like to be handled a lot. I only handle my animals as needed, usually for cleaning or medicating purposes only. I also do regular health checks on my critters and that involves handling them. Bearded dragons... they can handle a lot of handling. Chameleons...not so much.
Lighting.... I do not like the CFL's. (Compact florescent lights) and some may disagree with me which is fine. From my observations ( I did buy some for testing) the linear bulbs tend to be more consistent for our chams health.
Also from looking at your photos.... is there any chance that direct sunlight hits that cage during the day? I have a line of thought I'm following and that would be the last piece of the puzzle.
Your animal does appear to have metabolic bone disease starting in some of those arms. If the vet didn't catch that you need a new vet. Once MBD gets going it is fatal in advanced cases and a symptom is lack of appetite. if he did not have that when you got him then it happened while you had him and the lighting could be a factor in that. If he OD'd on vitamins organ failure can occur and that could also be a cause of the issues you are seeing.
Then there is always the chance he ate something he shouldn't have. I knew a guy once who had to use ant poison in his house. A cricket had gotten loose and was captured by his little sister who figured tossing it in to the cham was a good idea. She didn't know the cricket had gone thru the Raid despite it acting "weird" (was dying) and the cham died as a result.
I can give lots of info, or even examples, of things that can happen to Chams. You have to be the detective, you have to think and evaluate what went wrong by gathering info. That way your next cham will live a long happy life.
Sorry for the book. Once I come out of my cave I tend to type. Usually I stay in my cave...
I have a 3 month old Veiled Chameleon named Ignacio.
