What Am I?

I am the heart pounding, Head throbbing feeling inside. The feeling you get when you know. Know that I am coming closer, And closer, And closer. I am the foot tapping Hand shaking sensation The feeling that creeps up behind you And grabs your waist and squeezes, tighter And tighter Do you know what I am? Do you know how I frighten you every time? How you know I’m coming, And yet you still shiver I am with you always Lurking and waiting around each and every corner Waiting, just waiting Waiting to make my move I am fear!