Ok, so I know I'm paranoid that someone is watching me and it usually doesn't bother me cause I'm used to the feeling. But lately I have been so tense and looking behind me a lot. I get the tense feeling in my back like someone is looking at be or is behind me and my body knows. Being tense and having to look behind me all the time and seeing things and even smelling thing that aren't there is bothering me bad. I need some help or advice please.