One comment would be that a year and a half is a very short MLC. Did you seek help for the lethargy and depression such as anti-depressants? I'm sure you know that depression can cause the symptoms you describe. Did you shut yourself off from your family and friends at this time? As you were coming out, who did you reconnect with first?
Can I ask how old you and your W are?
You are your own ray of hope in this Spirit. You know what your W is going through. You came through this. There's a real chance your W will too. Are you invested enough in your M to wait and see? As I said, a year and a half is a very short MLC. Depending on your W's issues it may take her much longer to face those inner demons.
Do you remember facing what the real issues were that were causing your depression and unhappiness?
Stay with us and keep posting. We will support you when you stumble. That's what we do here. A tight knit group that have walked or are walking the same path together.