I am a newly re married mom

I am a newly re married mom. My ex has custody of our three children because I was too sick to care for them five years ago. I recovered from my illness 2 and a half years ago. He has a wife (my former friend) who has been stepping on my toes for years. Because of so many lies told by him and by her to the courts, I now have very few rights to my kids. Furthermore, she runs around claiming them to be hers, interfering with my contact with them, and even writing all kinds of hurtful things on my kid’s facebook pages and posting mushy photos of herself and my kids (even though she has five of her own). I didn’t deserve to lose custody. But now I not only pay child support that I can barely afford, which goes up in interest every month, but I am tortured by this awful woman. They ways are too many to list, but please believe me, and offer any advice you have if you do. I scarcely see my kids, and this woman really enjoys torturing me, almost as much as my ex does for divorcing him, something he didn’t want, but needed to happen because our relationship was unhealthy, and abusive. What’s worse is this woman does everything in the name of love, but is a snake in the grass. I know it, my new husband sees it, friends of mine see it. But nobody that can do anything about it sees it, because she is so cunning and is such a liar. Please help, if you can.