By January/February you will probably have been rejected by every MD school, or your app is at the bottom of the pile. And at that time, i'll wager that nearly all IIs have been sent out. Ditto for DO schools. At best, you're be interviewing for a spot on a wait list. These school will appreciate your donation, though.
Retake but ONLY if you fully prepared. Then apply in the next app cycle.
You will need to improve substantially. And keep in mind that we're talking about a career-deciding, high stakes exam...approaching it like you did make Adcoms wary of people who make poor choices. I have colleagues who would reject you alone for that.