OCS is so short and they cycle so many Candidates through, they can't afford to keep anyone there to recover. I got six stitches in the back of my head about 3 weeks in and it wasn't a problem. I broke my foot on the washboard trail at the end of the crucible (still finished) and they let me stay on (I was #2 in the company). They used my initial PFT score and I had already finished all of the other graded PT events. A friend of mine ended up getting cellulitis and knocked himself dingy for a couple of days. They sent him home, but he was allowed to return the next year. I think it just depends on how bad you want it. If they can tell you want to return and be an officer, they'll work with you.