Surely if the HDR draws in negative energies, it should be completely avoided by people who do not know how to protect themselves in those situations?...Fortunately you knew how to protect yourself, but i dont think the average person has that ability....I understand it may be frustrating. Everyone who uses the HDR gets different experiences. Science is about hypothesis each test may get positive or negative results. I had a friend who had nothing, and in a similar situation. Then he got the obe experience.
Remember that negative entities can be drawn in as well. I had on experience when I was asleep something pull me off the couch, well it tried. You need to approach with postive energy.
Keep trying, I am sure you will get results.
Goodness knows how many desparate people who sadly try anything to communicate with family members who have passed over are very vulnerable to negative energies should be warned about the HDR..