My situation is very similar. Difference is I have given up and have done so for many years. I direct my full attention to my partner, my daughter her husband and three little grandchildren and other family members. Sadly my son has become a lost cause. He is now on the methodone treatment. I leave his future with him and the mental health team. He was diagnosed with schizophrenia at aged 21 but was going wacky before. He was an A grade student at a Grammar School. A brilliant student, musician, gymnastics, horse rider, skier, you name it he was good at it. He is now middle thirties and looks like a walking skeleton. We are all amazed he is still alive. Heartbreaking? yes. But life is for the living and he is barely alive. Extremely frightening person to be around. You win some you lose some. That is life.