Why would she get custody when her scheduling choices (and work schedule) don't match up with the kids' needs? When you are the nurturing parent with documented proof, no less?
Aren't there lawyers who know how to rip the velcro butts off the other? Why is she in the driver's seat? After all, the best defense is a good offense.
You're filled with angst when your kids are limited to cereal and soda pop at their mom's house. And now you might possibly be limited to two months a year?
Go guerrilla warfare on her. Nip, gnash, unsettle her position to the point where your are the pain in the ass and she just wants to be done with you.