Man, when I did this program, about halfway thru when it started getting to heavier weights I felt like this for a good 15 minutes after each set.
Honestly, I'd rack the bar and then just as graceful, as to not make everyone think I went unconcious and passed out, as I possibly could I'd just lay down with my lungs and legs on fire for a good 5-10 minutes contemplating dropping a 45 pound plate on my cranium. Actually, at one point I decided to do it... but failed miserably at even budging the plate.
Yeah, it happens every once in a while. Usually on leg days. It usually happens to me if I'm not feeling too good, or I ate something crappy pre-workout, or didnt eat anything recently before I lift, or dont hydrate properly. It could be a number of things.
Just take it easy when it happens. Take a break, take longer rest intervals, drink more water, etc...