Hi Jiggs
Wow, you have been on quite a journey with this. As Dee says, I'm glad you are here.
I'm not much older than your son and though I wasn't as deep into addiction as it seems like he is, I know how devastated my parents would be if I had spiralled further out of control.
It sounds like it is a big deal for you to draw a line and stop pouring energy into trying to fix it. I do think this is the right decision; your actions so far have not changed his behaviour. I hope he finds a way to make a change soon so he can live the rest of his life happy and sober. Your love and support will have raised his lowest point.
Love to you x