The first thing that i would suggest is kick the weed habbit if you haven't already done so. Cannibis is a psychoactive drug which is believed to be a contributing factor to the emergence of schizophrenia. Also something to reasearch is Have any of your close relatives ever been diagnosed with schizophrenia. The fact that you know about Thought insertion and thougth broadcasting lead me to believe that you have done some reasearch on schizophrenia, so that is definitly a good thing. If I were you I would also talk to a psychologist about all of this, because to me, it does sound like you have a mild form of schizophrenia, namely Paranoid Schizophrenia. It appears to me, from what you have written, that you are having audio hallucinations... If you haven't already please see a psychologist....

Hope this helps some,
Jason