Son (22) with schizophrenia

Living with someone who suffers from schizophrenia is very difficult. Even medicated it seems he lives in a different world and stares a lot whilst smoking cigarettes like a steam train.
Sleeps during the day, spooks around at night.
Any advice about healthy diet, less coffee and smokes, is ignored.
He will never live a productive life.
We've lost family members close to us on the way because of his behaviour and them not understanding mental illness.
Ofcourse I worry about our future.
I need to be single as no other man can live with us.
I need to work full time to provide a roof over our heads and pay the bills. Without me, he'll be homeless, jobless and suicidal as his paranoia would kick in, specially when he thinks the meds are only given to him as he is a guinea pig and 'they' are trying to change his DNA...
I've always wanted children but no one never told me how tough it would be if a mental illness strikes the 'Brady bunch' family image with a thunderbolt.
A medal to anyone who cares for someone suffering mental illness.
They need all the help and support they can get. They deserve better too. Mental illness you don't see from the outside, my son looks like a healthy good looking young man but has no future. Maybe with support and someone pushing him out of his shell but some have tried and given up.
I have given up a marriage and another 7 years old relationship and noe bought a small unit to care for my son, indefinite. We have no other family here as Migrated here in 1987.

My love for my son is very deep and I am so proud of him he went to hospital last year and still takes his depot shot every month. However, I feel anxious and worry all the time. He has applied for DSP (disability pension) but he tells me if he gets rejected, and 'they' want him to work, he will stop the depot needle. It takes his motivation and energy away, He knows he can't work 8-5pm, neither with or without meds.
My good sense of humour is slowly fading but where there's life, there's hope, right?
Thanks for reading my story.