My Iguana doest seem like it feels well

Question
What should I do my iguana seems weak,his eyes are droopy and he doesn't seem to want to eat..

Answer
Hello Gary,

Well, I need more information regarding your tank setup, etc.
How old is your iggy, a male or a female?
What type & brand of UVB lighting are you using?  A flourescent tube bulb or a compact or coil light?  How old is the UVB light?  What type of basking light are you using?  A bright white light or a colored light?
What are your temps on the basking end & the cool end?  How do you measure the temps with, a digital probe, a temp gun, or a stick on type?
What sized tank is he in?  What is the humidity?
What foods do you feed?  
Do you give calcium regularly?
What type of substrate do you have in there?

Tracie