I need help fast, guys.

Here's the rub. You don't need help. He does. You want him to be helped. He does not. You can't fix this problem. He has to fix it. Drug addicts don't want help until they hit rock bottom. The only thing you can do to "help" is push him towards rock bottom. That includes doing things that will be uncomfortable for you, him, your family, and your relationship:
1. You could notify authorities.
2. You could swipe his stash. Tough to get high when you don't have the goods.
3. You could tell your family.
4. You could call 911 and tell them he OD'ed.

You're going to be forced to do something that sucks or do nothing at all and wait for him to destroy his life even more or perhaps even kill somebody or himself. I don't envy you this position but it's probably not your fault and unless you have big brass ones, there's nothing you can do about it.