Welcome to SR. I am so sorry you are going through with this and I know the frustration of trying to talk some sanity into someone wrapped up in their addiction.
Sadly, nothing we do or don't do will make any difference. No matter how much we cry, yell or love them, they don't stop until the pain of using becomes greater than the fear of stopping.
What helped me find my balance again was to go do live meetings. Nar-anon, Al-anon and CoDA are three similar fellowships that have helped many of us. Maybe find a meeting near you and give it a try. You have nothing to lose and everything to gain and I promise you will be glad you went.
Please keep those babies safe too. It is too easy for them to find drugs that were carelessly left out and the outcome could be tragic.
Others will be along to welcome you also. Please make yourself comfortable and know you are among friends here.
Hugs