Been there...Sorry to hear it.
I've been divorced for about 8-9 years, and I'm still paying child support (3 yrs to go for one, and 5 yrs to go for the other-- I see the light!!!) and it's so effing expensive (In my state, it's based on combined income, then some calculation and % of custody, etc...)
But, looking back it really was the best thing that could have happened to us, and we are both so much happier now. Plus, I get to be happy with my kids vs. being miserable. We still get along (we don't talk except about the kids, schedules, etc) but it's not a bad situation...and our kids are better off.
Granted, that didn't happen over night...but it does get better.
Good luck on finding a bike and finding peace.