Welcome Shawn, and thank you for the history lesson! More help will be along soon.
Have you tried an Al-Anon meeting? Not only will you find others who are dealing with the same issues, chances are very good you'll make some friends in the process. You'll also learn to focus on yourself, you can't control or change your girlfriend.
I can relate to your story because for many years I thought that the only things I needed in life were my wife and my alcohol. When my alcoholism took over and she'd had enough, my world came apart. So I understand what scared and lonely is. AA helped to heal that, with continual meetings I have friends, a support system, and a place to feel safe.
Best wishes to you.
Scott