Hi Sara. Welcome. Don't stress ok. Just focus on doing the wise thing when it comes to you and the kids. Your husband will have to work this out himself. You did not cause his problem. You can't fix it for him. And it's NOT YOUR FAULT. He's just doing what an addict does. It's no reflection on you. You have no control over his choices.
The idea of stashing some money away is a very good idea. Strip clubs and cocaine are very expensive and he can blow through all your/his cash VERY fast. Open up your own saving account without his name on it and start stashing money there. Also, you may want to check your credit card balances....
Keep reading and posting. You'll figure out what to do. This will work out ok. I know it seems horrible right now. But you and your children will be ok.