I'm so sorry this is happening to you. I'm sure someone will post some relevant scriptures to help you get through these attacks, but what I can add is, although I don't have demonic dreams, I do have very disturbing, disgusting thoughts that I know are from satan himself. I immediately rebuke these thoughts and demand my mind and brain to obey Christ. In Jesus' name, I tell them to get out of my head and mind and leave me alone. I have no idea why I have these thoughts, but I know what the scriptures say about the devil being after us night and day (in my own words there). He absolutely is.

You're not crazy or possessed. Your probably a great Christian who's being attacked by satan. Luckily the fight is already won: Jesus is our warrior and has won this fight against satan, demons, and hell 2,000 years ago. Just remember and know that He that is in you is greater than he that is in the world.