In spite of what you may read about working mothers losing custody, it still is not the prevailing theme.
Most moms still win custody.
If you lose control of your emotions, you're more apt to undermine your ability to make rational decisions Research your case. You'd be surprised how much you can learn on your own by going to the law department of your library and reading about custody issues and options. It's equally important to document everything. Get letters from professional contacts expressing the kind of parent you are. Your child's doctor, teacher, pastor or Rabbi, scout leader or sports coach can contribute letters of endorsement or even appear in court, if necessary to account for your quality of parenting.