Hi charmedp4, no worries, you didnt offend ! I think you are what is known as a "sensitive" someone who picks up on things other people can't– Someone with more intuition than usual- and dejavu and forseeing things before they happen is involved with that too.
Also– being an Empath is very involved with that- I could tell you have Empath tendencies, just by what you said here:
"…because sometimes I'll get these really bad mood swings that come and go when i'm in public and then suddenly go away, or when someones mad i'll get mad too, or sad, or happy etc."
That is exactly what empaths experience– You should look into ways of grounding yourself in public because it's not fun experiencing other people's emotions– unless they are positive emotions of course! Many of us sometimes experience other people's nervous stress energy, and that's not fun.
One way to protect yourself is to actually imagine a white layer of light completely covering you as a cocoon. Some say that if you envision yourself covered by a pink light, you will still be protected, but will also not be cut off from those around you . If you want to be totally cut off- envision white light.
I personally also pray and ask for Divine protection as well, but that is just me–
Another way of protecting yourself is by every morning, imagine there is a zipper running from the center of your gut, up over your head and down your lower back. Get your hand and move it all the way up that area –up and over your head and as far down your back as possible. This is known as the "zip up" technique, and is used to help prevent psychic attack.
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I don't think you are seeing vampires- I think you felt someone's soul watching you though.–possibly a human soul who never crossed over yet too.
The modern cameras do pick up orbs, even faery flying by. There are unseelie faerie and there are those Fae who are more positive minded. I don't know if that one that little laugh was unseelie or not– or if he/she just wanted to be bold and get your reaction.
Bright blue lights flying around have been seen by others as well- from some of the testimonies I read. Some say they are pixies-and the blue light is thier energy you see.