Really Spooked, Please Help

I've got a bit of a problem, I'm normally a rational person, you know the kind that hears a bump and puts it off to being the radiator. But I've found that this approach to life is becoming incredibly difficult. I'm 15, and I've experienced quite a lot of, unexplainable events recently. One of the biggest things was when I was about 10, I used to sleep at my Nan's on a weekly basis, but I refuse to go there anymore.

I woke up early one morning, went to the bathroom across the other side of the hallway, and as I looked to my left I nearly fainted, the thing must have been around 7 foot tall, and it was leaning on the wall, in a slouchy way, the strange thing is that it was smoking a cigar and wearing a suit and brasses, but its head was like that of a mouse, but more, ravage, you know, like its eyes were hollow and its mouth just spooked me, so I walked backwards into the bathroom were I stayed for like half an hour, I looked out of the bathroom and saw the front door swing shut, I then stayed awake until my Nan woke up and now I won't stay there again.

Now as I said before I'm a rational person, and thus, even at 10 I was sat there in the bath trying to figure out what happened, I couldn't have been a dream, cause I stayed awake all day after it, and the door to the house was like, triple locked, so I'm just confused about what I saw, plus whatever it was looked at me, so its not just a shadow because it was moving.

Another little thing is that my family friend thinks of herself as a median, and she refuses to enter my house as she says there is an evil spirit on my landing, which I don't really believe, but my mum keeps mentioning that as she walks into the hallway she can hear whispering, and I can to, but only if I stand with one foot in my front room and one in my hallway, its like an angry whisper that gets louder. But I can't really make anything out.

There's a lot more things, like I see faces if I look into dark corners, and they get worse if I close my eyes, I can sometimes see my granddad in dreams, even though I've never seen him, or any pictures, as he died when I was a month old, but I do have his silver bracelet. Sometimes I wake up and feel like I'm being sat upon, and I feel as sometimes when I'm in bed something brushes past me, it just seems weird.

For a 15 years old to be seeing what I'm seeing and I'm what you might call skeptical, but also open minded, and I'm starting to doubt what I thought was reality. I just want some one to help if they can please.

Thanks.