Just so so sad and can’t see this ending well

My beautiful son, Adam, 28 has been in active ketamine addiction for 7 years.  We have always managed and supported him and kept it private of course! Sadly, in the last few months, due to changes in behaviour I have had to call the ambulance and police out several times as he was in psychosis, didn’t recognise me, thought I was a demon and hit me. We have been absolutely devastated by this and due to my younger son, being physically disabled and having support with his care financially from our local council have also had social services involved.  Adam has never been violent before so we cannot risk him seeing a demon in his brother who cannot defend himself. He has worked with the local mental health services to just get by and thankfully due to him engaging so well and social services visiting and chatting with my other son have been happy that he is not as risk! Adam was really quite positive at the beginning of the year and I do know that stopping is the easy part and he needs to still get support and help so this past week has been using again a lot. His bladder is already fucked and he goes to loo every 10 mins but I just can’t cope with this emotional drain in my home anymore! I need to be strong and positive for my other son who lives with a life limiting condition and is also so sad about his brother x Adam blames everyone and everything in his life except the one thing that is destroying him :(
Sorry to rant - there is so much more x I know you will all understand and that I think is all I need x