Support request - Parenting while mentally ill

I live with PTSD; most of the time I'm ok and I'm well connected to supports. I'm working hard on recovery, including getting sober.

I co-parent a wonderful child, nearly 12. His father has gotten increasingly hostile, especially after I experienced several serious mental health crises over the past 12 months that included self harm and suicide attempts. Although I did my best to keep this from my son, he has seen me that unwell on two occasions.

My ex is now refusing to comply with our custody arrangements on the grounds I've traumatised my son. First and most importantly, I'm working very hard to get supports in place for my boy, including therapy and peer support with other young people who have had similar experiences. I'm also more well than I've been in a long time. My son has repeatedly said he wants things back as they were.

But I have a fight ahead to sort out this custody issue. Mediation failed yesterday after my ex refused to discuss options, even after I conceded to everything he wanted except a very long timeframe before a return to our custody arrangements. I've instructed my lawyer to issue an intention to file against him.

I'm going to be ok, and I know with the work I'm doing to help my son, the support I've proactively engaged with and the sustained effort I'm making I'm likely to see a return to our standard custody arrangements. But I also know it's going to be stressful and tough.

So if anyone out there has any similar experiences with mental illness, courts, parenting and custody arrangements, I would be incredibly grateful to hear from you. I'm going to do this with as much help and support as I can - it's the best way to look after myself, and I intend to pass on the support to others when I'm on the other side of this.