I guess everyone who says that this isn't real, or is 100% psychological have never really experienced it. Sorry, but mental problems don't make things fly off tables and smash into a wall. Mental problems don't change the temperature in a room. Mental problems don't create apparitions that several people can see...everyone seeing it without any prior suggestion. I have been touched, paralyzed, and even strangled by things I cannot see.  
 
Sure, one can say that it is all in my head or there is a physiological cause for it. I used to think that, too. I had medical tests including EEG to rule out some type of seizure, but everything came back normal. That leaves psychological. I do have post traumatic stress disorder and Dissociative Identity disorder. If you don't know what that is, I wont try to explain it here. That said, I will say that SOME of the physical symptoms could be attributes to dissociated body memories/abreactions. But I know that some of them are not.  
 
I am a survivor of satanic abuse as a child and have a history of satanism. It is absolutely real. I find it odd that many Christians believe in angels and miracles, but they don't believe in demons or curses. A lot of people who believe they are cursed, really are not. But that certainly does not mean that NOBODY is tormented by evil or by curses. One thing I will say is that whether or not it is real for an individual, the only way to know for sure is by finding a good therapist who believes in the possibility of spiritual oppression.  
 
Read books, talk to pastors...get a lot of opinions. If it becomes clear that you do need deliverance/exorcism, for petes sake do NOT let just anybody who calls themself an exorcist work with you. You will wind up worse off than before!! I know because it has happened to me. I have yet to find someone reputable who understands both dissociation and spiritual warfare. I have to believe that there is someone somewhere, otherwise there is no hope for me.