I don't know if you are talking about trying to help this person who is a psychic vampire or if you are referring to the way of protecting yourself. But I would work better my aura of protection and make a banishment to the vampire of my life. I don't think it pays to help, the vampire will want to suck you more and more. Only help if he wants to be helped.
Anyway, this is just my opinion. I hope I've helped