Ok, let's start by not thinking that after some weeks you have overcome the addiction, this is a very long race, Smithsonian.... give yourself the time and work on the mental part, the reasons why you start using some mind altering substance... make changes in your life.... lead a healthy life, get rid of toxic relationships, find some kind of aftercare, the one that may work for you... all the best :)
well you could start by stop going to the dr and getting it! unless you get it somewhere else. ive never heard of that being sold on the streets. sounds like you need to start seeing a counselor or atleast going to NA for support.