Is it possible he's dehydrated? Some of the symptoms and treatments of dehydration can be found at this website:
http://www.icomm.ca/dragon/hydrate.htm#signs
One symptom is general lethargy (not moving around much, sluggishness) but lethargy is a symptom of many other things as well...
It might be a good idea to take him to a vet as soon as you can if this doesn't improve and you think it's not dehydration that's the cause.
Check around to see if you have a reptile vet in your area, I'd imagine in Dallas, Texas, there would be a few.
Just so you know what to expect, a vet trip plus x-ray and meds has cost me 60$ (Canadian), but it could be more depending on the meds.
Good luck and keep us updated