Hello, I'm a recovering heroin addict. I have been clean for over two years, however in my active addiction, a needle broke off into my arm. It was about three years ago and has never been removed or problematic, however all day today and right now my arm has been throbbing and feeling really painful. I'm kind of worried and am not aware of what kind of risks, and how severe, having a needle in muscle tissue is. please answer...scared.