have you tried taking Suzanne4's study program? it's free, and she has a 100% pass rate for those who follow her plan exactly as she says.
she has a post on how to start her program, in the NCLEX forum here:
http://allnurses.com/forums/f197/new...an-195774.html
have you looked in the NCLEX forum? there's lots of people there who have been in your shoes. you're not dumb!!! you made it through nursing school, right??

you can do this. take a breather, and start suzanne's review plan. don't study anything else but what she suggests.
what are your weak areas? does your state send you a breakdown of the areas you need to focus on? maybe you want to review those areas a bit more thoroughly?
or is it test anxiety?
whatever it is, you can overcome it. lots of other people have been where you are, and are now licensed. you can do it too!!! i know it's hard on the ego, but please take a break for a couple days, dust yourself off, and start a new review.
Good Luck, and feel free to vent here or ask questions anytime. You'll find lots of support here!!!