What's your "beastie?"

Stress.  My whole life I have been on top of my business, never worried about tests, school; I was always on time, everything seemed to work out, and when it didn't I didn't worry about  it, just let it blow past me.  Lately this has not been the case.  My four "A.P." classes are toppling over me, draining any mental capability I once possessed.  This causes school to slow down to a trickle, days seem like weeks when I'm within this confinement.  Basketball, which has always been my most natural talent and comes easiest to me, is killing my ability to stay physically and mentally strong.  It feels like I'm getting my body beat worse than ever from opponents, it's always been tough being double and triple teamed each game, but now it has intensified, putting more strain on my little ability to keep my head in a game.  There's so much pressure from my coach to succeed and lead the team through thick and thin, it's breaking down my emotional strength, and now I feel weak and feeble.  I cry all the time now; something abnormal for my personality.  It's affecting my relationship with my family, friends, team, coach, and boyfriend.  If it's all in my head, why can't I conquer it?