Thank you for the replies. I took the exam yesterday and did not do well, just as I feared. I scored a 670V and 440Q. After having a panic attack, I spoke to admissions folks and my academic advisor here at Harvard. They set my mind at ease about the test. They said the verbal score is great. The math is extremely low but faculty reviewing the application may take that to mean that I haven't done any math in a very long time. That goes to the poster who talked about the math portion being teachable. I believe it is but I also don't know if I could do much better.
As of this point, I do not plan to take the exam again. My advisor said that I should if I wanted to do so but that I shouldn't be anxious about it. If my AW score comes back low, then he said I really must retake it. If I get a 5 or 6, then the choice is mine.
I think I will wait to see the AW score and spend the rest of summer working on my SOP.
Good luck to all going through this rigamorole!