If not a physical cause (i.e. electrical, etc.).. then you may be aware of spiritual activity. I feel a presence in my house but luckily they are helpful souls that enjoy living with me. What you must first figure out is: do you feel a threatening presence or a welcoming presence? Even as you read that question, which one stands out most? And that will let you know if your fear is of the overall 'paranormal', or if it is a warning of danger.
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