sounds to me its the drug repocussions that are your own "beast"....its something i think thousands of australians deal with Im sure.
But its hardly PTSD though - you will have no idea what someone with this actually goes through.

I think you are just peeling off being paranoid from previous drug use and i havent taken drugs myself but im sure its a gradual thing which will wear off once its out of ur system. Hang in there !