MrBond and the others are spot on about MC being a bad idea right now. You mentioned being married 20 years and seeing it work many times, sure it works when BOTH spouses are willing to work on things but it NEVER works when one spouse is a WAS. What you need to understand is a WAS situation is different than anything you've been exposed to before. What works in saving a troubled marriage does NOT work with a WAS because the marriage isn't troubled, it is OVER. read DR, you're not trying to save your M, it's already done. You're trying to attract your W back to a NEW relationship and marriage.
Just to piggyback what AS is saying here, your marriage is very likely over and MC would not only NOT be useful, it would actually be one of the line items on your W's list that she can check off and say "tried that...didn't work."
MC can actually reenforce the WAS desire to leave and divorce.
-PM
M:12y - BD:12/11 - D:6/13 - 4Ds
"The ultimate measure of a man is not where he stands in moments of comfort and convenience, but where he stands at times of challenge and controversy." -MLK Jr.