Is It Imagination Or Real?

I am Vinay, living in Hyderabad, India. I want to know if I am hallucinating (or my imagination) or is it Reality?

My story goes as:

Every alternate day, when I am alone in home, at night, I feel that someone is watching me. And whenever I am going to fill water in kitchen in the night, since I know the location of water filter, I don't switch on the light, but when I open the door, I feel like someone is standing there and sometimes feel like they are hitting me or catching my throat to kill me. But I don't feel anything physically, but this comes as thought or imagination. After this, I go to pray the lord for everything he has given me to thank him at night before sleep.

The lights are on, but I feel like some lady is shouting at me, wildly laughing at me, when I ask her (in my mind), what she wants, she says, I want you and to kill you. Inside I feel instinctively that she is my past life lover and somehow wants to take some kind of revenge.

I visited a psychatrist and he told to do breathing meditation and these things are my hallucination or my imagination. My wife also tells me the same.

Sometimes, when I would be about to sleep, I would feel and (in my imagination as my family says), I see that lady sitting and making rounds on the fan or on the ceiling, watching me, laughing at me.

My wife says, I read lot of horror or ghost stories or watch movies, so this happens, but when I don't read or watch horror movies, still I feel or see the image.

Request the team to let me know why only I feel such kind of things, and nobody else feels or sees anything. And all these things happens, when I am alone.

What needs to be done. I just keep praying to lord to protect me from her. She does not dare to enter into my prayer room.

(Sorry for my bad english and incorrect punctuation)