I'm not a QP and never will be, but my two cents:
From what I've read about SF qual, it's not a picnic for anyone. I believe good ol' Team Sergeant posted a lengthy diary of someone going through the course. It's a great read and covers the young man's struggles poignantly.
My point is that with the right motivation and heart, you can
grow from your experiences, and the experiences of others like you.
Never quit. In moments like these, your mind is your own worst enemy, remember that. It will lie, cheat, and steal from you if you don't keep it focused and busy.
EDIT: In fact, it was The Reaper and Basenshukai who made the posts I spoke of. They apparently cover Basenshukai's experiences. GREAT writing:
http://professionalsoldiers.com/foru...read.php?t=153
http://professionalsoldiers.com/foru...read.php?t=857