HCBM is really affecting my mental health too. I wish I had some ways to cope too OP.
My partner has finally got her to mediation 2 years after separating, but after a couple of sessions she is point blank refusing to allow him more than 2 nights with the kids, with no weekend time. The kids are desperate for more time with their Dad and make up excuses to spend more time with him -- for example, on his days with them, they pretend they have tummy ache so they miss their swimming lessons, saying they'd rather spend that time with their Dad, and the youngest (5) calls Saturday "sad Saturday" because he "has to go back to Mummy".
She is extremely controlling, emotionally manipulative, continually breaks boundaries and then distorts the truth to make it look like we're somehow the unreasonable ones, she moves goalposts, is the queen of gas-lighting, often drags the kids into the middle of conflict and thinks that only she knows what's best for them. Ever heard of the term Golden Uterus? That's her in a nutshell. She believes that all of her actions are completely justified and can't separate her feelings from what the kids actually think, or what is best for them. Thankfully, my partner has such a good relationship with the kids that her attempts at parental alienation are not working and, in fact, probably working against her. The kids are starting to show signs of resenting her (one said the other day "she's calling tonight? Again? But she called last night! I don't want to talk to her but she'll be annoyed if I don't."
I'm exhausted from the conflict, control and manipulation and have no idea how to protect myself from it. She's literally ruining our lives and getting away with it. Not to mention the damage she's doing to the kids. I know I need to step away and let my partner deal with it, but it's so hard not to get involved when her self-centred attitude harms the kids and affects our lives. I want to remain positive about mediation, but can't help but feel we're going to end up in years of legal battles.