If you look at the image of one being preying on another to survive, you can see that the idea of vampirism isn't too far fetched. The specific kind I want to address is the one that preys on your energy body.
A lot of the time, our modern day vampires are very charming, entertaining, they might be good listeners. On the flip side, the less pleasant version might be a bit more manipulative, provoking you to feel guilty or selfish, if you don't share the goods (your energy). And then there is the silent type; the person at the supermarket, or the party that takes your energy without you ever noticing their existence. Like a thief, as sneaky as a pick-pocked they walk off with part of your belongings.
The way you will know that you got robbed is usually an inexplicable sudden dip in your energy. You were fine walking into the meeting and two hours later you are utterly exhausted, even though you had a pleasant time.
At some point, you might feel burdened by a relationship but the other person has always been so nice to you, that it makes you feel guilty even admitting it to yourself.
Some people respond with anger towards energetic vampires. (Also read post 'The Gauges') You might look like you are being difficult and unfair towards that person, but really listen to the message the anger or annoyance is communicating to you.
The good news is that:
a) you can get your energy back, if you notice that it got stolen and
b)you can work on your energetic protection so that vampires can't plug into your field.
How do you do that?
By asking for it. You may or may not be aware that the divine forces are only allowed to intervene, if we ask for help, unless it is an emergency.
As soon as you realize that some of your energy has been stolen, you ask for it back.
Who do you ask?
You put out your request/prayer to Divine Source/God and any Angel or Master you are working with and you ask for all of your truthful energy to be returned to you in all time and all space healed, transformed and purified (you don't want your laundry back dirty, do you? Who knows where it has been!)
The same way you would request protection in all time and all space. I usually visualize a bubble of white light around me where and vampire will get zapped, if they try to steal anything (why not teach a little lesson, while we are at it?).
Two pointers:
1. If you get robbed of energy even though you had your protection in place, ask yourself where your crack was. Usually you will find yourself having some pity, guilt or anger towards that person who undermined your result not to feed them anymore.
2. Have compassion for the vampires. Even though their actions towards you aren't very nice, remember that the soul's that choose to steal from others, usually feel very depleted and have lost their own connection to Divine Life Force, therefore feeling like they have to take from others. After protecting myself and getting my own energies back, I usually pray for their healing so they might put their vampire ways to rest.