This to me reads that you have a serious self control issue. If you need to use rehab to limit your use of heroin, you’ve fucked up. Learn and practice some self control. You don’t need rehab, you don’t need to stop buying heroin or cut off ties with your dealer, just stop using it. This is like needing to have your parents tell you to do your homework or something. You are in control of your life. You will feel much more empowered if you do it yourself.