I've had my fair share of demonic experiences. I have been attacked multiple times, including being choked out. It all started when I first started praying and seeking the face of God. In fact, when I would pray alone in my room at night I would hear tapping or noises and felt a great amount of fear and the enemy won for a short time. I wouldn't pray at night because of this.
Almost four years later, my spirit has grown tremendously. I no longer fear demons what-so-ever. Although they still attack, I have learned how to over come them through Christ. Remember Paul’s story about the possessed girl following him? Yelling in the streets "They are of the most high God!" For three days she ranted until Paul turned in "annoyance" and castes the demon out of her. Key word, annoyance. He was not afraid. The spirit is greater and do not under estimate it! I believe, if we continue to nurture and strengthen the Holy Spirit with in us, no demonic force can touch us. Unless of course, God is sending them to "strengthen out spiritual combat". In my case, although I was scared, God had made me so much stronger and opened my eyes to the spiritual world.
I have a very different view on possession. I don't believe it is anything like the movie "the exorcist" or "paranormal activity". I think (from experience) it is more of being "trapped in ones mind". Yes, the devil is (at that point) able to influence you more so and can block your senses and alter ones actions; however, God is always there and can over rule anything. Keep praying my brothers and sisters and correct me if I am wrong.