Negative entities on astral plane. Possible demon possession?

First and foremost, I would like to share some of my background. I'm currently 21 years of age and have been experiencing sleep paralysis since the age of 17. During my first episodes of SP, I would experience no more than extreme humming and vibrating sensations throughout my entire body. Around the 5 or 6th time it happened to me, I woke up face to face with what I can only describe as a "dark" version of myself that didn't have eyes; the eye area was completely black. Some of you may be thinking that I may just have a strong imagination but I assure you that my imagination doesn't just make this stuff up. Lately my SP episodes have been drastically different, instead of the humming and vibrating sensations that I used to experience, now the arms and legs of my ethereal body are being manipulated by a mysterious energy. The energy is very powerful, it feels somewhat magnetic in the way it flails my arms around. Last night, I struggled with this thing on and off for two hours and became very annoyed to say the least. The SP first hit me before I was even halfway asleep and that crazy energy came creeping up on me. I woke up, brushed myself off and laid my head back down. Immediately I go back into SP but this time a pole was being pushed against my chest which was very painful. The entity kept trying to trick me into thinking I was asleep by using my parents voices and manipulating my environment but it just wasn't working. What do you all think about the pole being pressed against my chest? The only thing I can think of is that the pole was there to keep me inside of my body. I'm not a religious person and haven't been for a while now but after two hours of hell, I took a shower, prayed to God and was able to get some good sleep. I haven't been myself for a while now and my dog has been going crazy at night, i really don't know what to do. I want to empower myself to be able to fight off these kind of things but I feel as though my efforts are useless. These energies are extremely strong and I can literally feel the pain they inflict on me. Any thoughts on this or suggestions would be very much appreciated! thanks