Kay, this is a very powerful write that some people can relate too. I felt the emotion within the piece. I like the subtle rhyming.
I like how you go through the emotions of needing your fix, hiding it from people that love you, getting it and the come down from it because I believe though it may give you a 'high' as to said it doesn't last and when you come down its just like (if not worse) before you had a high.
The only suggestion is a typo on nervous.