Nightmare

I think I am being stalked! I have this recurring nightmare that feels like it is coming true. This nightmare always hide in the deepest and darkest places. The main creature in this dream feels like a real person now, that is the scariest thing. I feel like this person is real with all my emotion I have never felt this way. Out of all the things I don't want it to be real but I think he is. If he is real, he is stalking me. I seen someone on the street a couple of times that matches to much description from my dream. I am scared. Please help me.