Left Depression and Became Depressed

After years of marriage to a depressed person, I decided I had to leave. She was becoming darker and darker and more isolated. The happy person I met almost never smiled anymore. She shunned friends and family. She wouldn't go to counseling. about a month ago, I finally moved out.

Now, I am the most depressed that I have ever been in my life. I have never felt so alone and hopeless. I have lost 40lbs in under 3 months. Today, my doctor put me on antidepressants.

I don't know what to do next. I want my wife back, but I want the happy one. Now that I'm depressed, I can see how deep of a hole it is down here. Can I do anything to get her out and rebuild our life? Or is she at the point where only she can decide to do it?