I think it's rather odd that therapy isn't covered. I guess I've got a good plan with mental health benefits, I don't even think I have to specify what kind of therapy I'm undergoing; therapy is therapy, whether for marriage problems or depression or what-have-you.
That being said, sometimes you can find low-cost or free counseling through community groups or churches. I don't necessarily think you have to look only for marriage therapy per se - as long as whatever counselor you work with has experience with relationships. Lots of pastors do counseling, and there are some forward thinking ones - perhaps look for Unitarian or Reformed churches. Google your area for women's groups, too. Maybe you can meet someone who knows a resource. You can also see if there are any programs run by your town or county. All the best to you!
The world opens up... when you do.
Oh, oh, can't you see? Love is the drug for me. ~Bryan Ferry
"Love is that condition in which another person's happiness is essential to your own." ~Robert Heinlein