Whether or not these parasitic entities are part of us, separate, neither, or both- from what I understand one can rid oneself of them by focusing on and embodying their opposite: love and light, or finding a Light Being/Guide in hyperspace or Dreaming to assist.

I sincerely wish you the best and know you can beat this thing. Have faith in yourself. Embody love and manifest it in every aspect of your life.

You might find these threads insightful:

Interdimensional parasites,  (alien, demon, etc)

How to "combat" malevolent entities in hyperspace?

Hyperspace Fool seems to have a lot of experience/knowledge with this stuff; you might want to send him a PM.

Good luck.