Basically, I got extremely sick the day before the SAT Math 2 test and got a 770. The other two subjects I took, Bio and Chem, I got 800 and 770 respectively. Is it worth retaking again for a perfect score in November for $77, or does it not matter that much?
Your scores are fine, save the $77.
Unless you are aiming for a school such as Caltech or MIT you are fine.