My chameleon is showing signs of MBD it has been for close to a month now and it's getting worse. He has "double elbows" he is very lethargic and his bones seem bowed. and lately he has gone on a hunger strike.
You may be overdoing the D3. It should only be used a couple of times a month.
The quickest way to correct a calcium imbalance is to get a vet to give the chameleon shots of calcium until it's blood calcium levels are high enough to give it a shot of calcitonin which rapidly draws the calcium back into the bones. Once it's back in control you need to make sure your husbandry is correct to keep it from coming back.