Imagine achieving your goal after working at it all your life. You have a wonderful family, a lovely home in a peaceful neighborhood, a successful and happy work, and the rest of your life to live. Imagine then that you start to notice individuals watching you one day.
They aren't folks you know or have even seen before that particular time. But after that, you constantly run across them–standing, looking, and possibly waiting. It is an utterly unwanted interruption to the surface-level perfection you worked so hard for, which causes the discomfort and paranoia to start to take hold.
How would you respond? What would you do?