Thursday's appt

Well, my first actual "treatment" appointment is coming up on Thursday. I am already starting to panic. The dentist gave me a prescription for Valium - just two pills - and I need to get that filled. I'm supposed to take one the night before, and the other one hour before the appointment. This worries me becuase I don't have a ride home from the dentist and I'm afraid I'll be terribly high or something....can I take the bus home in that condition? Does anyone know? I never take drugs and have never had a Valium....