SweetHeart, I looked through your past posts to find out what his care is like.
What you may not know is that it was not all that many years ago when chameleons were considered almost impossible to keep alive for more than a few months.
The reason was that it was not known what they really needed in order to be healthy or even stay alive.
Now, much more is known but many people are given bad advice and sold the wrong things in even the well-known petstores---which really should know better and should at least provide accurate caresheets, but don't.
One of the main things to know is that chameleons have very little ability to live in conditions that are not nearly perfect.
They
need certain temperatures, humidity, sprayed and dripped water, foliage for hiding and drinking from , UVB bulbs, basking bulbs, a variety of well-fed, nutritious feeder insects, cages that are very large compared to the size of the chameleon, very clean environments and supplement powders to ensure that none of the nutrients they need for health is missing.
I know that your cham has had a difficult time and that his care before getting to you was not very good.
If you give him the best possible care, hopefully he will regain his health and live a long, healthier life with you.
This caresheet is a good one to look over to ensure that everything is the way he needs it to be:
https://www.chameleonforums.com/care/caresheets/veiled/
It was mentioned that he may have or have had MBD.
He also went to the vet recently and had a hemipenis amputated.
Did the vet check him out and do anything to help overcome the MBD?
What parasite or parasites does your cham have? Which medication is he on?
Parasites rob nutrients from chams, weaken them, make them feel and become sick, stunt growth and can kill the animal.
It is necessary to get rid of the parasites for these reasons.
Some medications can cause a cham to lose his appetite but there may be other factors making him not feel like eating, also.
Ensuring that all of his care needs are the way they need to be will help him to heal.
Since you haven't filled-out a "how to ask for help", I'll tell you that there are or were some serious things wrong which have to be changed in order for your cham to hopefully recover and stay healthy--if you have not changed them already.
If he is still being kept in a 10 gallon tank, it is stressful for him and an unhealthy enclosure for a veiled cham.
You may already know that stress makes it easier to become ill and makes it far more difficult to recover from illness.
Hopefully, he has since been moved into a larger, mostly screened cage.
You said he has a ZooMed 120-100 MAX with a day and night light which is red. so during the day the temp is about 80-90 and at night like 70-80 more around 80 now since its summer
It seems like some very intense light for a small enclosure, which may be overheating him and causing health problems such as dehydration.
Also, chams should have 10-12 hours of total darkness AND they
need a UVB light during the day when their basking light is on.
Calcium dust without any phosphorus or D3 is the most frequently used powder--typically every or almost every meal
Calcium with Vitamin D3 should only be used twice a month.
Too much D3 is bad, but some is needed.
Multivitamin powder is the same--2 times a month--not more often or it, too will cause health problems.
If you want to help his bones strengthen, Phoenixworms, silkworms and hornworms are all good calcium sources.
Crickets are high in phospshorus and relatively low in calcium, which is why they need to be dusted with plain, phosphorus-free, no D3 calcium powder.
(Important to know about hornworms is that you must only feed captive raised hornworms, since hornworms that have eaten tomato plant parts are poisonous to your cham.)
More about how to give your cham all the nutritients he requires:
https://www.chameleonforums.com/care/food/
I don't have a clue about his humidity or basking temperatures, since they weren't listed--but you should definitely monitor those to be sure they're not too low or too high--and making your cham physically stressed.
If you look at the caresheet in the first link I posted, it tells you all you need to know about his care.
As Kinyonga said, if he opens his mouth willingly, then just drop a bug in.
Wishing you well and hope your cham recovers to have a happy, long life with you.
