Bro I've been on and off heroin, a lot of friends a few family members decided to take the detox or methadone route. Honestly, you're three days clean, just stay off it man. You're almost through the worst part of the withdrawal. If you can get through just a few more days your withdrawal symptoms should subside and you should start getting your physical strength back. To reduce the chance of relapse, as this is common for me after withdrawal symptoms subside, try counseling, meetings, alternate hobbies, or finding a girlfriend as your physical looks should start to recover!