So, test anxiety used to get me too. There are some really good specialists out there that really helped me deal with it.
The short version of the trick is this: bilateral stimulation. Look it up from more reputable sources than anonymous online chat rooms. Ever notice how you feel better, less stressed, after a walk in the park? Think you can't really do that on test day? Wrong.
What I basically do is quietly clap the fingers in my into my palm, like this.
http://www.youtube.com/watch?v=L1tsCOkCoC8
You do that three times on your right hand, then stop, then three on your left, then stop. Do that until you start to relax again and you should be golden.
Also, take a freaking LSAT prep course! With a score like that you probably self-studied, right? If you did use them, do it again! Kaplan worked wonders for me. That was about the score that I had when I started, then I took a year off and studied for the LSAT while working part time (you also get to add job experience to your resume that way, which helps you get jobs later [the whole point of law school] and helps get in to good schools, and gives you something to talk about during interviews). Bottom line, my LSAT score jumped 20+ points, not because of some magic formula, but because I worked my ass off and dealt with each problem that came along - including test anxiety.
My GPA sucked and I needed a solid LSAT to go to a good school. In this market, don't bother applying until you get 165+. You probably need to be in a T14 school to get what you want. With that GPA you can be competitive at Harvard, Yale, Stanford if you take the time now to get your LSAT score up.
Seriously, studying for LSAT is the best time to get ahead in the legal rat race. Take your time to get a 170-175, go to Harvard/Yale/Stanford and never look back.