First - med school isn't summer camp. You are going to endure 4 years of hard work and many hours in the library or hospital no matter where you go. While I've never been to OU, I suspect that the inside of their library looks the same as most of the top 10 ones, and the hospital probably looks comparable. The students will be similar (med school level credentials, albeit with different accents), the professors of the same caliber (possibly better because they are less likely to be research intensive). And the books and subject material will be identical. Sure, the few hours of free time you have per week might not be as enjoyable, but that won't be the largest component of your day - it's not like you spend much time sightseeing in med school, and so if there's a nearby movie theater, pizza place and bar, you are all set, because that is all you would frequent in any other locale.
Secondly, yes there certainly is a great risk that the OP wouldn't ever get another med school again, for the reasons raised by the poster above, who suggested the OP would be a less competitive candidate the second time around.
Certainly OU wouldn't touch the OP if their acceptance was rejected. It's hard to rekindle when you leave a bride at the altar.
Reapplicants are not viewed the same way as first time applicants at a lot of schools, especially the top ranked ones, from what I've heard. Substantial improvement is generally expected. And who knows how a given school would regard someone who had an acceptance in hand and rejected it. If I was a non-top school, I wouldn't accept someone who already rejected a med school in a prior year -- as the goal is to try to accept people who will actually come (and not be stuck hoping the best folks on the waitlist are still available when I come calling). And if I was a top ranked school, I would perhaps assume both that this person is prestige hopping, question this person's commitment to medicine, his maturity, and would take into account that his level of competitiveness was already determined by schools in a prior round (i.e. if the person applied before and this school took him, then the process has already decided that this level school is where he/she belongs. i.e. he was not deemed "top school" worthy in 2006, do his new credentials now make him so). So the OP could, in theory, not be guaranteed another acceptance. Why risk it? Do well in med school and do your residency at a top school in four years.