Mrrzy,Be kind to yourself and if that means wallowing, WALLOW bigtime. Don't let the anger turn to guilt. Be sad, angry, disappointed, anything you feel, be. And then move on. Crying and throwing things can be therapeutic.
You are not redundant on your job or as a father. Love your children. Let them love you and your ex. Try not to let the anger touch them - they will blame themselves when no one is really to blame.
There is always another job. If you have to, you will find one. Meantime, try not to worry about what might happen. You have enough to deal with already.
In a way you have been given a gift. Now is when you will know who your true friends are and maybe even more important how to be a true friend yourself. It will get better.
SS