First off, I'm really sorry you are having issues with your cham. I love my little guy with all my heart, so I understand your stress.
Secondly, Marshall Mittens is the cutest name for a chameleon that has ever happened.
A few folks above have mentioned the possibility of MBD. Based on the limited information you have given so far, it sounds like you are probably doing some things right and maybe other things not quite right.
1.
For gutloading, the Bug Burger is good to use. It is generally recommended to also provide fresh veggies to make sure that the insects' nutrition is well rounded. I used BB plus turnip greens, apple cores, green pepper cores, and little bits of other things we eat around the house. Its easy to start saving scraps once you get in the habit.
2.
Gutloading is absolutely critical, so you are on the right path there. You also must provide supplements in powders. You have not mentioned any supplements, so my apologies if this is something you are already doing. You will need at least two different products: a plain calcium with no D3 and no phosphorus (
http://www.amazon.com/Repashy-Super...14533895&sr=8-1&keywords=Repashy+SuperCal+NoD) and a multivitamin with D3 (
http://www.amazon.com/Zoo-Med-Repti...UTF8&qid=1414533924&sr=8-1&keywords=reptivite).
3.
It sounds like you have had him for about 6 months? UVB bulbs do slowly go bad with time and need to be replaced. 6 months is the generally recommended schedule for people without a device to measure the UV output. It is probably time to replace his bulb.
4.
You are worried about him being dehydrated. Have you tried extra long mistings or dripping water on his nose to stimulate drinking? Can you run a dripper so he has access to water for several hours at a time? You can get a Little Dripper (
http://www.amazon.com/Zoo-Med-Labs-...qid=1414534065&sr=8-1&keywords=little+dripper) at most local Pet Stores or you can make one yourself. The trick is to get about 1 drip a second and position the water so that it splashes on a vine where he can sit under it.
Someone else already posted this, but the caresheet is an excellent resource of the all the basics. There is a lot of misleading and wrong information on the internet and pet stores often give out really bad advice. Read through the caresheet and see if you are on track.
https://www.chameleonforums.com/care/caresheets/
Also, so we can help you better, can you copy and paste this form and fill in all the information you can?
https://www.chameleonforums.com/how-ask-help-66/
Pictures are also really important. Try to get a good photo from the side showing how your chameleon's arms and legs bend.
