Negative entities/presence

["setiamon" <setiamon@...>]

I was wondering if anyone has ever experienced a sensation of a
oppressive/threatening presence while in meditation,or relaxed,i
experienced something very unusual recently a feeling of something
coming up close to me and covering me pushing on me,i even for a
second felt a slip into unconcioussness but came right out,i just
focused my "will" on pushing it out of my awareness and after a few
minutes it did.this isn't the first time i'v experienced the sense of
a negative presence a few times i'v even opend my eyes to see dark
figures where i felt the presence from.oddly anuff bardon doesn't say
anything about this in the initial aspects,is that because there is no
real danger?i have read and done shielding visualizations i found on
various site but that really doesn't seem to do anything.this isn't
continous just ocassionaly.is this something to worry about or should
i just ignore negative entities?