I tend to agree with Sometimes Psychotic. The knocking on the door and the sense of being followed is a common occurence here. I've been around less than a year and already know it as a pattern. Either we are the world's most interesting people, or some of these occurences are delusions and hallucinations of the psyche.

I do believe it is possible you heard real knocking and/or that you were being followed. I know at least for one person here he was literally being harassed. I just feel it is a much less likely explanation. At any rate, hiding doesn't really serve a purpose other than to fuel fear and paranoia. If someone were truly after you, they wouldn't let a door or four walls stop them. Rationally speaking the most likely scenario is that you are perfectly safe. Try not to give this more fear than it deserves, or at least try to balance the fear with some loving music or a comedy or something of the like.

I know you use marijuana from time to time. I'd definitely steer clear of that while you're working to discern what is going on. The potential for added paranoia isn't worth it.

Hugs Spikes. We're here for you.