I am sorry to hear about it. Relax. Some people are bad at test-taking, however they ace the technology in the field. My former Senior Net. Admin. could not bring himself to pass the MCSE,however in 7 years we have still to see a problem he could not solve in a short time, efficiently and successfully. From Novell to Linux to Windows, he KNEW the stuff.. but no certifications...
If I were you, I would take a small break from test-taking. If you have a home-lab practice with it. Take it apart, reassembly it, reconfigure it until you can do it .. in the dark, almost ;-)
Then refresh all the material for a week, and go for it.
Good luck !