My recommendation would to be to keep a powerful white light around your body at all times. Wear the white light like it is a spacesuit or a full body suit of armor that can reflect energy back at anybody or anything.
From what I can tell from your post is that this particular person's 4th dimensional version of self is probably in your energy field sending you unwanted energy.
So what you're going to want to do next is feel for the energy cord that this particular person has attached to you with and then cut it. You can use a sword of fire or any type of cutting instrument or weapon you choose.
Unfortunately given the state of the collective consciousness on earth today, most individuals are completely unconscious that they have dimensional versions of themselves running around causing trouble for others.
Here's a link to a meditation I created with Archangel Michael that you can use to cut cords to help maintain your energetic space:
Peace and Blessings