Still, it's terribly difficult to be followed.

I have the insurance company's hired PI following me much of the time, for 21 years! Well, they did back off a little this year, once I put it in writing that I will shoot first and ask later if I fear strongly. Usually I spot them early and let them know (like take their picture- this is very unnerving to most ppl. even PIs) or wave or stop and write their tag number down. But all in all, I can never be sure when it's "just" the miserable PI or if it's a real stalker.

I know how you adjust your life, because this becomes forefront in your thinking. Please try and work away from that "always on alert"...it's bad for your physical health also.