Hey notgonna, If you had kept on drinking, do you think you could've sustained that high performace for very long? Even if it is true that you were "empirically better" at what you do while drinking, my guess is that the people benefitting from that were the people listening, and the one paying the heavy price (leading to the ER) was you.
I think it's likely you can get your groove back, while being healthy. It'll just be different.
Do you think you may be dealing with some depression? It could be that, more than sobriety. You won't have been the first creative person to struggle with it. But flaming out is no way to go.
I bet patience isn't your strong suit, but try to embrace it! You deserve health and life, and you clearly have so much to offer!