Pygmy Bearded Dragon feeding

Question
Hi! Just wondering why my pygmy bearded dragon wont eat? I have had him for about 2 months and I started feeding him with pin head crickets. He loved these and enjoyed pouncing on them. Have tried feeding him vegetables but he won't eat them. Has probably 3 small cubes of snow pea before stopping. I tried him on small crickets and he ate about 8 or so which is a lot. For the past 3 days he has not eaten a thing and has barely moved from the same spot. Is he just full or could be sick? Thanks for your help

Answer
Hello Miss Kelli,

What type & brand of UVB light are you using is it a flourescent tube bulb or a compact/coil light?  
What are the temps in the tank, & what type of thermometer are you using, a stick on type, a digital probe or a temp gun?
Are you supplementing calcium supplementation on a regular basis?
Could you post a picture of him for me?
What type of substrate are you using, sand, tiles, paper towels?

Tracie