I'd like to say that OCS isn't that bad. I've read the posts by other candidates, and agree that the training is hard, but it's not impossible.
Yes the days are long, and the drill instructors reserve the right to "mash" you at any point in the day. But OCS is a mind game. You're body is capable of enduring, they're testing to see if your mind is. When you get back to your spaces at night, laugh about what happened that day. You're roommates will become your best friends.
Vicki and I had the unique privilidge of being the first class for a new DI, and he hit us pretty hard, but we both made it. The best thing to do is to keep your head up and push on. Also, don't smile in chow, that's just asking for a beating.