Regarding your gutload.... Check the link here right at Chameleon Forums under the RESOURCES tab and then under the FOOD & NUTRITION sub-tab:
https://www.chameleonforums.com/care/food/
Now scroll all the way down on that link, about 3/4 of the way down the page, where it says "
Avoid These Ingredients" ..... potatoes, romaine lettuce, and broccoli are on the list of things NOT to feed your insects. You feed those to your insects, and they provide almost no nutritional value, and are high in phosphorous. The list of "
Suggested Ingredients" right above that is a great list to go by as far as good gutloading materials to use. Now, by no means am I going to preach to you here; do as you wish. I'm just letting you know what's up and giving you the information that apparently you've never seen. That same good/bad gutloading info can be found in many other places as well, as I found many lists on many sites when I did my own research before purchasing my chameleon, and I complied a list of things to feed and things not to feed your insects.
If you scroll just a bit further down on that same FOOD & NUTRITION page, you can see a bit of basic info about supplements, under where it says "
Supplementation". I see by your profile pic where it shows you have a Veiled Chameleon..... you can also go to the tried-and-true caresheets section of the site here. Find Veiled Chameleons..... here, I will make it easy for you:
https://www.chameleonforums.com/care/caresheets/veiled/ ----- Now again, scroll down on this page all the way down where it says "
Supplementation".
"Calcium and other vitamins are very important to your chameleon's health. Feeder insects should be lightly dusted with powdered supplement before being fed to your chameleon. Many keepers successfully use calcium (
without D3 or phosphorus) at
nearly every feeding, multivitamin
once every 2 weeks, and calcium
with D3 once every 2 weeks."
Calcium
WITHOUT D3 should be given at almost every feeding.
You are using calcium
WITH D3, which should
only be given twice a month. This prevents overdose on D3 and allows the chameleon to get the rest of the D3 (s)he needs from the UVB bulb(s).
Your multivitamins should also only be used twice a month.
Exactly which vet are you going to? Have they worked with chameleons before other than yours?