being stalked by an angel

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its like 8ft tall and its really scary. it has no face and wears a trenchcoat, it also has red glowing eyes and a hat. the trenchcoat is grayish, in case that helps. idk why its following me and i need help, i didn't even believe in this sort of thing untill it started following me around, will someone please tell me how to get rid of it? it dosent do anyting except follow me around and look creepy, it stands at the foot of my bed, in my doorway and other doorways (what is with the doorways?) and seems to live in my sisters room. please help me get rid of it, i cant get to sleep at night while it is near me, unless i have my cat with me, then it goes away (dislikes cats?)