Sending you lots of love and prayers! Check out Rejoice Ministries, that has helped a lot of us. I have been standing for seven years and faith will help you through the hardest climbs -- but I do think I made a mistake not protecting myself earlier at least by understanding my legal rights. She is not allowed to take your kids from you, so you should start with family court to ensure you have your parenting time with the kids and that they are receiving counseling.
I read here that all you have to do to stand is outlast the MLC. You can't change it, but you can outlast it, or stand until you don't want to outlast it.
I was just thinking today about all the kindness and patience I showed my H and how it was met with evil beyond evil, but how living that is a good way to understand Christ (his story was the same idea!) and to trust that God has a plan. The plan might not be to fix things as you want it. Keep being the good man you are, try not to take anything she says/does personally, be patient in knowing that the truth will come out. But use the law to protect your kids and your right to see them or it will only be used against you later for even less contact. Doing that is another way to stand for your family. They need protection from your W at least for the time you can be with them, and they need a safe landing place. A priest once told me, "If your H was burning down your house, would you just leave your kids inside to try to show your respect for him?" I often remember this whenever I get confused about trying to figure out what is best for the kids, since it will usually contradict the MLCers desires and designs.
I believe I will see the bounty of the Lord in the land of the living. Wait for the Lord with courage. Be stouthearted, and wait for the Lord.