First of all, I would recommend that you take it to a vet. We can only give possiblities.
You said..."He is just lying at the bottom of his Cage, but he is still aware of things around him, but he aint making no effort to move at ALL?!"...does he have what looks like another elbow above the "real" elbow? Can you post a picture of him?
You said..."It tries to hold its body up, but it cant much, it struggles and shakes"..this could be a sign of MBD.
You asked..."Could he be Constapated??"...has he produced any feces lately? Is he eating? Do you have a substrate in the cage?
If he has MBD, then he could be constipated due to that...or if he is dehydrated or if he has ingested something that he can't pass.
You said its a veiled chameleon...to tell if its a male, look on the heels and see if there is a tarsal spur...
http://www.adcham.com/html/husbandry/glossary/tarsalspur.html
You said..."Basking Temp is currently 76-80F"...the basking area should be a bit warmer (mid to high 80'sF) to allow for better digestion.
You said..."Started usung a Tube, but now using a compact"...some of the compacts have been found to cause photo kerato conjuctivitus....here's the site with information about it...
http://www.uvguide.co.uk/index.htm
You said...."I use Nutrobal about once every two weeks, and Calci Power around twice a week"...I live in Canada and have never used Nutrobal so I don't know if its good or not. The calcium powder....does it contain phosphorous or vitamin D3?
If your chameleon does have MBD then the vet should be able to give it calcium injections until its blood sugar levels are high enough and then give it a shot of calcitonin to draw the calcium back into the bones.
If its caught soon enough, your chameleon might still live a fairly long life. As I said though, you need a vet to diagnose unless a picture shows undeniable signs.