Welcome Rinaezz, you've come to a good place where you are no longer alone.
The Nar-Anon forum here has a lot of members who have been where you are and who would love to meet you, so if you feel up to it maybe drop in and introduce yourself there. My son is an addict and I know the pain of watching someone we love destroy themselves.
Sadly, there is nothing you can do to change him, only he can do that. Say a prayer and know that he is in God's hands.
There are many things you can do for yourself to learn to live a balanced, healthy and happy life, regardless of how he is doing. Take a read around the Nar-Anon board, especially the Powerposts and other stickies at the top of that forum, and it may give you some idea of what you are dealing with and how you can handle it.
I'm glad you came and I hope you will stay and share with us.
“I will love the light for it shows me the way, yet I will endure the darkness for it shows me the stars.”
― Og Mandino