Some of the long termers on here will recall my story in a previous incarnation as Labrat.
In a similar plot to some of the others one here, my ex went (in my opinion) completely doolally and a 12 year relationship was over in the space of a weekend, however shortly after splitting she did a runner with the kids, I had to track her down through private detectives to 200 miles away, and fight for six months to even get to see the kids.
It really should have rung the alarm bells when I met her psychiatrist when we were both seventeen! (recovering anorexic... me quite happy being knight in shining armour helping her, her continuing with relapses, panic attacks etc. for years)
The court system is bollocks, do everything you can to stay away from it, as by and large the bloke will never win unless mum is a direct risk to the kids!
CAFCASS are actually surprisingly reasonable as people themselves, but very set in their ways - mum keeps the kids dad gets weekend contact is still the overwhelming outcome, regardless of what life was like before or what the circumstances are.
That was about five years ago, and I can honestly say that it **** destroyed me at the time, I was on the edge of suicide, some of the people here really helped me through that patch and I'm eternally greatful!
I've battled on and off with depression etc since, but things do calm down, and I'm pretty much fine - overall I have a pretty good relationship with the kids, and see them as much as I can, but nowhere near as much as I'd like!
At the moment I'm looking forward to a couple of weeks with them in the holidays (they'll also get another week and a bit staying with my parents, grandparents are a very useful tool making half the holidays a feasible request!)
So, chin up - please don't get too down, there is light at the end of a very long tunnel. Your kids need you now and in the near future more than ever before! Its all part of life
As for my Ex? Settled down and got remarried last year, had a baby at easter and she seems to have calmed down. The kids will make their own mind up about everything when they are older. Personally, I'm really, honestly not bitter, but would still quite happily do her in with a shovel and leave her in a shallow grave