About work: since you gave a reason already, there's no need to further justify. If your boss asks more questions, simply say I appreciate your concern. I apologize for sounding frustrated earlier. I'm looking forward to calmer times. No additional detail needed.

When I get anxious, I over explain myself and forget that some people are on a need to know basis. And not everyone needs to know every detail of my life. I do think it's important for an employer to know your life is changing. Divorce is a major life event no matter how you look at it. You are bound to have both good days and bad days. Keep doing your best to have good days and you will make it through this.