As a DO student in school, all you just said to me was blah, blah, blah, blah.
That whole thing (your quote) is regurgitated so many times at interviews and on these boards it make me want to vomit. We do prescribe pain medications as DO's (just like MD's), we do treat the whole patient (just like MD's do), we do focus on the person and not the disease (just like MD's do). There isn't any difference when you get down to the nitty gritty.
When people stop trying to make DO's different from MD's is when DO's will garner more respect overall and we'll stop having these debates on which doctor can piss the furthest.
All we do is learn some OMM. Other than that there is NO difference between the two, and anyone who tells you differently is lying to you and themselves.
By the way, retake the MCAT score atleast 26 or so, and you'll do fine. Adjust your studying skills obviously and either take a course or find new materials.