Is it possible?

I always wake up with this pain in my back. I could not understand the reason. I went through every possible test. all good with me but this pain haunts me all day.
Neither doctors nor me could understand the reason.

I AM SCARED!!!!

I am scared more now as there are bruises all over my body and worst of all, I don't remember what did I do that these are there.
My friend suggests that I might sleep walk that's and I might have fall down and that I don't remember because I was sleep walking.
I talked to my parents if I have any history of sleep walking? They denied and told me that I always slept peacefully, this is only thing I loved doing. Ya, I love sleeping but then how should I explain these bruises?

Days passed and I felt back pain worsening and these bruises come and go. I decided to put a camera in my room and check if I actually sleep walk.

So I went to market, bought a night camera. I placed it in the corner from where my whole room was visible. Before going to bed, I switched the recording button on and honestly didn't want to find myself walking around at night, I live alone and this thought itself was scary enough!!!

I woke up in the morning and in a very long time there was no back pain, only thing that i slept a little more. I hurried to office and totally forgot about camera recording.

Had an awesome day since I felt no pain at all. Went home, still forgetting about camera that i placed in my room.
Post dinner when i went in my room I saw that camera. Since I wasn't feeling any pain, I thought not to watch the recording. I went off to sleep.

Next morning, severe pain caught me, I could not move at all. I tried a lot but pain was too much to bear. All I could do is inform my boss that I wouldn't be able to come office. After texting I went off to sleep only to wake up in the evening.
Ok, I love to sleep but this was too much.
Still had pain but not like that in the morning.

I kept wondering what happened today and this time I didn't record anything. I decided to watch what at all recorded for previous night, I went through whole recording, NOTHING!!!

What the hell is happening to me?

I decided no matter what, i'll record every night and will find out what exactly is happening to me. I set the recording button and went off to bed and despite the fact that I slept the whole day, I slept again.

I woke up at usual time with pain lingering at my back. Before anything else, i decided to watch the recording.

There was nothing in there. I called my friend who suggested that I might be sleep walking. He came home and I showed him both the recordings.

He noticed a strange thing, that I could not, was my facial expressions. He showed me that my facial expressions are loud enough and they were like I feeling extreme pain or torture. Am I seeing bad dreams and those dreams are walking up on my mind and making me feel tired?

To this he uttered something I never heard of

PARALLEL UNIVERSE 

What the hell is this?

He told me that there is a chance that you are going to some parallel universe where you are being tortured or something. I laughed badly to what he said.

He was serious.