I have two recurring dreams.
One is I'm dead in bed, but able to see everything still just not speak or move and my partner wakes up and leans up on his elbow and is peering at me and shaking me and then realises I'm dead.
I usually wake up unable to breath with that one and utterly terrified.
The other is I'm on top of his building in NY and it's a bright lovely sunny day. He takes me by the hand and he's walking backwards smiling, leading me somewhere. When we get to the edge he embraces me and I think he's going to kiss me and he sort of turns me and leans back so our arms are out straight. Then he smiles at me and lets go of my hands and the retaining wall is no long there and I fall backwards, and I can see him as I fall just standing on the edge impassively.
Both of those I have had a lot lately and they are absolutely terrifying. I think it's your mind playing out horrible scenarios for you, your worst fears etc. I've tried lucid dreaming which helps, but still getting them fairly regularly.