I am possessed by a demon. i dont know for how long its be around but it started hearing voices in my head. ?

After the voices it became physical I see things and feel things. It can control my thoughts which I hate. Its always putting things in my mouth. it can do to much when I am consicous but when my eyes are closed on the edge of sleep this demon puts me on LSD or Acid trips because I see things cartoon or me doing something I that day with that I have the most Bizzare and wicked nightmares ever I hate it a lot because I can feel pain and touch in my dreams...I like sleeping seeing black and waking up if I smoke weed I can sleep if I can't pray enough to sleep. I know its a demon because it attacks and talks in my head. It put me in one of video games in my dreams not ******** cool you don't. Want to live call of duty. Need help from Exorcist