I did the following and I think they helped me. Hopefully they will help you too.

Instead of just feeling what was troubling me, I wrote down all of my concerns and worries (e.g. timing might be tight) in words, and also wrote down my own responses that helped ease my worry or strategies that helped me improve (e.g. Regarding timing might be tight, I decided that I will make two passes at a question; if I still don't get it, I will circle the question, choose an answer and come back if I have time). This way, I formulated a strategy to follow if I ever freeze and I made sure that I can control the "damage". I think test anxiety stems from fear, but sometimes what we fear might not be so frightening if we actually take the time to identify them and work on solving them (they are no longer in the dark with a vague shape).

Lastly, I think it is very important to trust your instincts during the test. I feel that the test is where you apply your instincts, which were trained through rigorous studying.