He was standing over me

[IscreamUscream]

Last night I was having a nightmare that frightened me so much I woke up sweating.I got out of bed and put my pillows on the floor with my duvet ontop of me and put them across my bedroom door. I slept behind the door. Although I am being protected by a panic alarm straight to the police for some reason last night in my nightmare my exp was standing over me while I was in bed. I managed three hours sleep and I'm shattered today.

Do you know about 'lucid dreaming'? Google it. Basically, before you go to sleep, tell yourself 'When I dream, I will know I am in a dream and I can change it.'
It works. You can change your dream, putting yourself in a safer place or addressing the issue. In the example you give, you might have changed your dream to have the police arrive and arrest your ex.
The side effect of lucid dreaming is that you feel unfinished, uncomfortable for a while. This is because your brain hasn't gone through the processes it wanted to go through. But, its ok. After a few lucid dreams, you won't be troubled by nightmares.

I have had this exact same thing. It was over a series of nights where the 'intruder' was getting increasingly close until he was standing over me. It was my Ex I saw (in the dream). It is sleep paralysis. Look it up online. I've had it since I was a child, but the last episode lasted over a week, I was exhausted and afraid to sleep as I genuinely thought I was going to die in my sleep.

It did pass though. You can be prescribed anxiety meds for it.

I've done lucid dreaming myself and with my DD when she was having nightmares and it definitely made a big difference.
The way I dealt with it is exceedingly woo (am Pagan, it's to be expected!)and will probably get me strung up on here but relaxation techniques and some kind of music you find relaxing will help as well.
A chat to your GP won't hurt either, especially if a lack of sleep is affecting your day to day life x

It's him and the uneasy feeling I have that he is eventually going to come for me. It's almost like a game of chess waiting for his next move.

Have you had any counselling at all?

I'm due too next month, just hope I can have some peace from him and get on with life.