Positive Reviews Make Me Nauseous

Tonight I took a deep breath and posted my latest book, Workshop 'Til You Drop, on FaceBook.  I have a really weird reaction to positive critiques -- it paralyzes me.  My instant thought is "Oh no...  What if I let them down?"  Negative critiques make me really sad, but I move forward.  Probably to prove the nay-sayers wrong.  My world is an upside down place :)