Amy,
First, You're not alone!! Second, what could you do to make this evening fun and relaxing for you and the kids? Is it possible for you to rent a movie on the way home or pick-up pizza and some pop-corn? Maybe take the blankets off the beds and use them to build a tent over the dining room table and let the kids eat dinner in the tent with flashlights.
I know it's hard but try to keep your mind busy so you're not concentrating on the neg.---like your husband having to go to work tonight. Think of things you could do to support yourself this evening in a healthy way and entertain the kids.
Wish I had a magic answer. Thinking about you today!!
:)