Help! It's haunting me!

Hello grans and grandads alike, I need help, please.

First off, if you believe in such things, oh thank goodness. But, if you don't, well I hope it never happens to you!

I don't consider myself any different than anyone around me, well, I'm a bit cookie but aren't we all, sometimes?!

A little while before Christmas I had a sudden rash of visits, to put it the only way I can.
I'm not an empath, medium or anything like that, at least I'm sure I'm not although I have had visits in the past. Until the run up to Christmas I'd only ever had one that scared me badly, and that was a few years ago.

Anyway, I sometimes have a cat that jumps on my bed, pads around and then settles. I've never seen it, but I feel it's presence. It's only been in this house, which I've lived in for 5 years. The cat was the only visitor here, until this one that is, quite frankly, scaring the heck out of me!!

Suddenly, it...he, I think it's a he, appeared! I swear I am awake, but I suppose I could be dreaming. I feel awake, though!!

He came into my room and at first I thought it was the cat, but I've never actually heard the cat walking in. I heard it/him walk in then I felt the bed behind me going down as he laid himself down, just as a partner would if they were coming to bed late, but I suddenly just knew it wasn't good!
It took me a while to muster up the courage to turn over and look behind me,. I half turned, just enough to see who it was, sort of hoping it was just my housemate sleepwalking or sitting there for a moment to see if I was awake, unfortunately it was not my housemate!!

I saw this frail, little body wearing a blue & white striped vest type t-shirt, dirty and dishevelled. The body was so thin I could have counted the ribs. The head seemed a bit too big for the body, pale greyish-white in skin tone, with hair that in remembering later, to try to describe to my DD, I could only describe as looking like Gollum from Lord of The Rings ----sh't, my front light has just dimmed to almost off, thank God there's a light behind me, too!!!
I think Gollum is so cute, but the visitor is NOT!!

I felt, more than saw, that it was grinning. It was faced away from me, thank God as I think I'd have screamed the house down!
It left me soon after, quite suddenly and I spent the rest of that night sitting up in bed with my lamp on.

The next night I was alone all night, it didn't visit. Until about 3 nights after the first visit. Pretty much the same happened, except that I saw it's face, it's eyes looking at me, a stupid grin on it's face. I closed my eyes tightly, willing it away!

I slept with my light on for a few nights afterwards. It visited again before Christmas, on the other side of my bed, and I found my voice that night and screamed out for my housemate, who didn't come running but admitted next day he thought he had heard something but didnt hear it again so he went back to sleep! Then nothing until last night (Monday night). I heard my door open, letting in some light, I heard the patter of small feet like a child coming in to tell me they weren't feeling well - I'm sure you've all heard those over the years.
It got in behind me, I kept still but I started saying, "I know you're not real, you're not really here. Leave me alone, just go away!" As I said the last bit I felt it getting out of my bed, and I slightly relaxed. But, it walked around the bed until it got to where my face was and it bent down to me and it bloody well went, "Ssh-sssh!" Like you would to a little child - even though I had my eyes screwed shut so I wouldn't see it's face, it somehow seemed a bit humorous - then it stood up and went right around to the other side and got back into my bed!
Momentary humour over I started praying to God and trying to remember The Lords Prayer, and I felt it leave. It didn't seem to like the praying!
But it worked.
Soon afterwards, I got up. My housemate is ill and was getting up, so I got up, too.
Oh, I forgot, just before the shushing I'd attempted to shout for my housemate again. Thankfully, he (housemate) knows me well enough to know I don't joke about such things!

I'm not normally a religious or praying person, but I'm actually scared to go to bed so I'm downstairs on my sofa right now, my body feeling like it's covered in goosebumps!
The light suddenly dimming started those off and hopefully it's just that the bulb needs changing!

Please help me, what can I do to make sure it/he doesn't come back??

I'm so sorry for the long rant.