Really sorry to hear about that, have you already received your grade or are you just assuming you failed? I know sometimes you can just KNOW you failed, as in you don't know the answers to anything, but I know that I myself have said to myself "man I bombed this" and actually passed with flying colors, so keep the hope alive if you haven't got the grade yet. Wishing you the best of luck and hope that the others keep you afloat.