The Narcissist taught you how to control your emotions (via Grey Rock or ODA) for a damn good reason: because whatever you focus on and react to (especially with strong emotion) will grow in your experience.

If you want parasites and energy vampires to go away, you give them no emotional reaction.

The same is true of anything else that manifests in your life that you do not want to stick around ... No emotional reaction equals no energetic charge to feed the negative manifestation.

One more thing: The more you evolve as a Lightworker and Conscious Creator, the more you will realize what an incredible teacher the narcissist was. And no matter what manifests, always trust that your Higher Self (co-creating with The Universe) knows what it's doing ...

Stay in a positive state and use that thing to your advantage.