Dream Demon

I've always had this dream of a really tall guy in a suit, but I know he is a Demon. His face is hard to explain its just empty and dark. I've been dreaming of this demon since I was 10. I am 18 now, and it has usually been good dreams, and good times I've had with whatever this thing is, but it always had a eerie background and uneasy feeling to it even though i was having a good time.

His name is Mister and if i ever try to tease him in my dreams about his name he gets beyond mad and starts yelling and he just seems to fill the whole dream, even though he doesn't grow his presence presence is very intimidating.

The other night it was just a bad dream, the only really bad dream about him. It was us in this room that looked like a mixture of my home and a graveyard and he started to choke me.I could really feel it, and he said in a horrible monster growling inhuman voice "Leave me alone!". Then I woke up and i gasped for air as i felt his grip go away.

People say they think its a sleeping disorder but i think its something more and idk what to do. Ive always been sensitive to spirits ever since living in a haunted house from the age of 9 to 11. How can i leave this being alone like it wants? I dont know how to stop dreaming of it.