What is the meaning of a doppelganger? help!?

I'm very sensitive to the spirit world and I accept it. however, things have been getting much scarier for me. Weird sounds where no one is at the time, shadow people, bed shaking....but today topped off every experience I've ever had. My husband has been out of work for 3 months, he went back today. he left... show more I'm very sensitive to the spirit world and I accept it. however, things have been getting much scarier for me. Weird sounds where no one is at the time, shadow people, bed shaking....but today topped off every experience I've ever had. My husband has been out of work for 3 months, he went back today. he left the house around 7:30 and I stayed in bed, wide awake but not ready to get up. About an hour later, our bedroom door opened and closed, I heard someone walk around the bed and felt them climb in. I was facing away from that side of the bed and keep my eyes closed for fear of what it might be. Then it put its arms around me and it felt just like my husband. So real that I wondered why he came home from work. I asked if it was him, and it replied "yes", but he was crying. then the bed began pulsating, I turned around and he was looking at me and then disappeared. this was the scariest thing I've ever been through, I was fully awake the entire time. I talked to my husband on the phone shortly after, he's fine and having a great day. What do doppelgangers mean? Is it just a weird thing or is it a premonition? I'm so freaked out right now.
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