After reading your experience, I can say tht it was all anxiety that bogged you down! However, now since you have seen it all once.. I am sure the 2nd time its gonna go much much better than this. Just dont give tooo much importance to a $250 test and that should soothe your nerves down. At the end, its just a test and nothing more. keep tht in mind.
You should retake. All the best for that
