Posted by Roger on 1/16/2017, 12:01 am, in reply to "Green Iguana" 188.8.131.52
All I can suggest is that something really scared him. It could have been an airplane or a bird. Iguanas change slowly, so give him a week or two to recover. Also, they don't soon forget things.
If he doesn't recover or gets worse, then something could be stabbing him with pain, like a needle or other foreign object he picked up off the floor and swallowed. X-rays would be needed. Any dog-and-cat vet can do that.