Hi,
It is very tough and I feel for you for you as it’s not going to change for him until he needs help. However you are not alone and the guys on this site are great and really supportive, but if you would like some more help for yourself please contact The Icarus Trust.
We are a charity that provides support to people like yourself who are dealing with the addiction of a family member or friend. We have people you could talk with who are trained and experienced and would understand what you are coping with. Maybe you would find that helpful.
You can contact us on help@icarustrust.org or visit the website http://www.icarustrust.org