nice and familiar

this rushing back and forth, and the constant tension and anxiety at the corners of my stomache. its only slight enough to be noticed and felt at all times, but it never quite fully crosses the borderline into overwhelming. a part of me enjoys it though, it keeps me awake and moving. it keeps me thinking and planning. it's second nature to me now, and i don't mind it much. i'd just really like to know the source behind it.