(((Steve)))
It sounds like you are experiencing a process that many of us have. I dug in deep too, because I was so enmeshed in my son's struggle that I abandoned my own life in the process.
This became true for me:
When the pain of letting go, becomes less than the pain of holding on, then you can let go.
We all stumble a bit, especially at the beginning, but I too missed my old life. I was happy more than sad, which was not the case once addiction hit.
I am happy now. Sure, things aren't perfect, but they are good.
You'll get there too, if you want to bad enough.
Congratulations on the big step forward!