Angelic,
I'm going to be very blunt with you, because I want your iguana to live.
I see a lot of people in your post below saying it's not your fault that your iguana isn't well. I disagree. You obviously have not done any type of research before buying your pet. For example, the food you are feeding him is really not the best. And what's more, you chose a sick iguana because you wanted a calm and cuddly animal and did not educate yourself enough to know that iguanas are rarely calm or cuddly as juveniles.
Now don't get me wrong, a lot of people who have no idea what they're doing end up being the best iguana keepers. This is because they have no idea the amount of work involved, but they love their iguanas and so will learn to do anything to keep them healthy and happy. You sound like you have a loving heart and really care for your iguana.
However, I see a dangerous pattern starting. You chose your iguana because "all the other ones were crazy and mean." If you really love your iguana, then understand this right now: In Iguana Terms, crazy and mean = _Healthy_. Lethargic and calm, especially for juveniles = _Sick_. Healthy iguanas wriggle, whip, and bite when they are little. They hate and fear you and want to escape, because to them you are a predator. Anyone who tells you something different is misinformed, or trying to sell you something. Perhaps a sick iguana.
But the good news is that if you take your iguana to the vet, and you handle him every day, and you feed him the right food, he will learn to trust you and will let you care for him. He may even learn to like it. And you will have a wonderful friend for (hopefully) the next 20 years or so.
No matter the sex of your iguana, if you do things right and s/he becomes sexually mature, there will be many months out of the year that he/she is moody or even violent. You will not be able to trust him around your face, your kids, or anything green, because s/he will bite and hiss and scratch. S/he can not help it. That is just how healthy iguanas are in breeding season.
So I am telling you this now: Get ready. Read everything you can find. Go to anapsid.org and read everything. Go to the library and ask them to find copies of Melissa Kaplan's book on iguanas and James Hatfield's "Ultimate Green Iguana Owner's Manual". Go to the grocery store and the web and learn what the right things to feed your iguana are. SAVE UP SOME MONEY. As much as you can. You will need it for vet bills and the giant cage your iguana will need in about 18 months.
Others will tell you "It's not your fault". Do not fall into the trap of believing that because you didn't know what you were getting into, or because you rescued an iguana, that you don't have to do everything your iguana needs. "Hey, a life with me and no vet care/correct food/UV light is better than dying in the petstore, right?" Not true. At least dying in the petstore is quicker.
This rant is not directed only at you- If you know other iguana owners who think this way, don't let them get away with it. Rescuing an iguana, or being an ignorant new owner, does not entitle you to slacking on the iguana's care.
You are off to a good start now, because you have found the wonderful people on this forum and you are headed to the vet.
Here's to many years of happiness with your new green friend.
-Erin K.