Also registered for August and interested!

First of all, I give you a HUGE amount of credit for being open about the psychological stresses and physical responses to them that you push through in relation to taking tests. It takes real courage to ask a question like that, and more people should feel empowered to do the same.

Although I haven't taken the test yet (taking August 29th), one of my personal strategies for not letting the anxiety have too much control over me in general is as you imply, taking a mental "cleanse" the day before the test. The day before test day, you know that you have done everything you could possibly do to be ready for the exam. If there is no substantively new knowledge you can learn on the day directly preceding the test that would make you feel less stressed about it, then in my view it is simply not worth putting effort into it.

My biggest advice would be to not give this test more of your psychological and physical energy than it deserves. We are going to all get through it together-- I truly mean that. Absolute best luck to you!