The other thing to think about, and really figure out, is WHY do you have a 2.48 GPA? Was it your study habits? Did you get in over your head or schedule too much and then not know when to bail out? If it's your study habits, did you not put in enough time, or did you simply not study effectively? What would you do differently?
Don't just take more classes to get into a postbacc or med school. Figure out exactly what went wrong and exactly how you'll fix it, because you WON'T get into med school with the numbers you've got now, and you've got an uphill battle to turn those numbers around. You SHOULD think about whether there is any other career that will make you happy, because this is going to be hard.
Once you figure out what happened, and how you'll get better grades in the future, then you can retake any prereq courses in which you got poor grades, study for the MCAT and kick its little MCAT butt, and start taking advanced sciences to slowly pull up your grades and show you can do this stuff. And look at DO schools, which may be a little more forgiving about the lower GPA you'll still have at the end of this road.
Good luck! It's kind of a fun journey, even though it's hard. (I'm in the middle of a homemade postbacc, myself.)