Was this a demon? What should I do about it? It attacked me?

Basically what happened is me and my best friend L went to stay the night at her house. Her house is fairly old and we can feel the spirits in it, because there are several. There are 5 to be exact, and only 2 of them are evil. So we felt watched that night and when I was getting ready for bed it felt like someone was putting their hand an inch from touching my skin and moving along my arms and body. Then when we were sleeping L woke up and said she felt something in the room with us, 2 or 3 things. She said that we'd boh moved towards the middle of the bed and I was curled up in a ball asleep and she made herself move back to her side before falling back asleep. The next day we were talking in the tv room and one of the ghosts started making noises. We heard the sound of walking, of something tapping the walls, and the sound of it tapping things like glass on glass. We were the only ones alone in the house and we checked to make sure that no one was outside to make the sounds. Then we decided to walk around and experiment to see where the tappings had come from. I walked into the back bedroom and as soon as I hit a certain point in the room I felt nauseous and pressure on my skull. Something evil and very angry was watching me. I stepped into the bedroom and it felt like something was going to attack me but I backed out of the room and went to get L before it could. We came and she felt the same thing i did in that exact area in the hall, and we both felt like something was grabbing our vaginas. She went into the bathroom and found where the sound was coming from and I went to stand in the doorway to the bathroom. I felt something come up behind me and froze. It felt evil and then it attacked me. I felt pressure forced onto my head and my knees gave out and L says she saw me in the mirror as I sort of fell forward but then MY ghost grabbed me before I could fall to the floor. L said my head jerked back and it was like someone had pulled me against them. The thing that grabbed me just held me up and whatever had attcked me stepped back and watched. I could feel it thinking and it was more of an "really? You saved her, this should be interesting..." before it vanished. Whatever had saved me stiffened and I felt it clutch at my stomache and the vibe I got from it was an "ohhh **** I shouldn't have done that." Then I ran off and both things were gone. a little later the tappings and stuff started again but the evil thing was gone and when L took a shower she said something kept turning the heat and cold on and off. I heard tapping and the thing that saved me was back because it felt like he was patting me down to make sure I was ok. The evil thing didn't come back but we still felt watched. And the male thing that had saved me stayed with me for a while before finally leaving.What i want to know is was that thing a demon? And it felt like it attacked me specifically, so why me? It also felt like it was threatening whatever had saved me buy attacking me. I've been in L's house several times and this had never happened.