Picture this.   You’re on cloud nine because you nailed a job interview. At least, you think you did. But then, you start having doubts and brood over how the interview might have actually gone; maybe you didn’t leave a good impression. Before long, you’re convinced that you’re not going to get the job. Then, a week or so later, you get a call saying you’ve been hired.   Here’s another scenario.   You catch the flu bug and your doctor recommends routine blood tests as a preca