For me its sometimes 'frustating' to see that people just don't 'understand' 'LOST SOULS', whether they are seen as orbs, ghosts or poltergeists, or whatever name you want to attach to it.
These LOST SOULS are named that way because they are lost.
They are torn apart between 'heaven and earth'.
Their fysical bodies are on earth, their spiritual and etherial bodies are in 'a' dimension, and with their emotional 'body' they can appear to US. They can make you sick; institutions are FULL with people who have (negative) lost souls around them, in their homes, etc.
There are ways to release these souls and its NEVER a good thing to do that on your own and without knowledge.
One must really know what it is and how it 'works'.
Just recently I was tricked into a lesson myself, after many years of experience. So what I want to say is: STOP HERE AND GET EDUCATED FIRST!
If you want to know and learn more about LOST SOULS, DARK SPIRITS, GUIDES and ANGELS, maybe I can help you out on:
Now What Is Happe.NING.com - in "The Silent Temple" and we can have conversations about this and other stuff you're interested in.