Paranoia

I have felt paranoia in extreme ways, about five years ago, I though my girlfriend had cameras in her eyeballs. I have had paranoia to the point of twisting someone's meaning to the exact oposite of what they would say, even if was a simple direct statement. I have had issues with drug abuse since early teens. I guess its the same old story, I would be amazed at my own actions with drugs, scared at what I would do next, a bit silly. Anyway, what I am getting at is that, is that I usually had a knowledge, on some level that my mind was falling apart because of the drugs. I have wondered often what it must be like for a nondrug using person entering these periods of paranoia. That must be even more scary.