My Scary Night Visitor

Late at night, I went into my bedroom. I sat down on my water bed, and tried to go to sleep. All of a sudden I felt my heart start to beat really fast for no reason. I sensed a presence in the room, I just couldn't see it, I sat up and looked over to the place where I knew it was. My door was closed but I could feel it in front of my door. I could have pointed to where it was, even though it wasn't visible. I sensed it walking towards me. Then I saw my water bed moving as if it was on my bed. I heard a whisper through my mind saying that it was going to kill me. I rushed out of bed and went to get some water. I felt a little better but almost immediately my heart started racing again. I felt a presence behind me, but when I turned around, I saw nothing. And once again I could point to where it was standing.

It has visited me a couple of times in the past month and I'm really freaked out. I have even heard deep breathing near my ear and my room has turned icy cold for no reason. And one morning I woke up and glass was splattered all across my kitchen floor. And nothing had broken. What do you think I should do?