Great avatar you have, and it's my second post to this forum too.
Let me share my experience as a guy who got a boot out the door from his now ex-wife after 11 years of putting her and our children through hell. It was exactly what I needed to get me into recovery after 27 years of alcoholism and denial. I've heard other men say "Looking back, I wonder what took her so long", and now I understand what that means.
You don't sound helpless at all. What you do have is the awareness that you can't change or control him, but you know that you have the choice to stay or leave, and you know that the most important thing right now is to take care of yourself.
Stay strong (you're anything but weak) and take your life one day at a time. At times it scares me not knowing what tomorrow will bring, but I know that my higher power gives me the strength to make it through each new day in recovery.