This OP definitely does not need a post-bacc, they need 2-3 months of solid MCAT studying, a year to do some sort of altruistic job, and a re-app nice and early next cycle.
Just because those newer DO schools accept people with sub-500 doesn't mean someone with those scores should apply and start medical school with that rocky foundation. OP, unless that was you giving it your all, retake the MCAT and re-apply. Living in Appalachia and an underserved community will be a great experience to have in your back pocket for applications in the future, especially with MD/DO schools who specifically focus on rural and underserved medicine. It would be a shame to waste that nice undergrad GPA.
Also, I know taking a year off may sound terrible to you right now, but 2-3 years from now you'll be glad you did it, imo.