You could go to the extreme and hire a private investigator or a hacker, but I wouldn't advise it.

Reminds me of two thoughts: "If you hear hoofbeats think horses not zebras"
and of Occam's razor.

Which is more likely, that your T is stalking you or that you may be having delusions?
I don't know you well enough to say. Ask yourself what motivation would a T have to go through the time and trouble to stalk a patient?

It is possible, but it may be easier to rule out other possibilities before going through the expense of a private investigator. A visit to your T or Pdoc may uncover more likely reasons you feel this way.