I am assuming you know what you're talking about, and offer ideas to deal with that.
I suggest two defense techniques while you try and find help by some experienced shaman/healer/psychic:
1. Mirror Shield: envision yourself surrounded by a globe that is translucent from the inside out, but on the outside is polished to a mirror sheen. This globe will let through positive energies but reflect anything negative back towards its origin, threefold.
2. Decoys: Envision yourself creating dozens, or even hundreds of "holograms" of yourself, and envision the "enemy's eye" following those holograms instead of you. This is to divert their attention away from you.
Maybe even buy a circular carpet, say about 2 meters in diameter, and put up five candles around you, then sit in the center of it. Envision a protective bubble around the edge of this carpet, additionally strengthened by the candles (if you believe color makes a difference, use white ones).
I also suggest asking Erin, Anna Conlan or any of the other psychics on here for help in identifying the source of this energy and ways to end its influence.