(((hugs))) to you my friend, and good on you for taking that step.
Now take a step back from him and focus on yourself. You have a store to run and a life to live and he's responsible for himself. You take care of you.
I would start with finding an Al-Anon meeting. Whatever he's using, the basic addiction behavior is the same, and your coping strategies will be the same. Lots of love and peace to you.