First things first. Go into a room my yourself with a mirror. Look in it and then check to see if you have balls. If you do look yourself in the mirror and ask yourself if you are a man. My grandfather and my father never missed work and spent a lot of days at work and I'm pretty sure they didn't like it everyday. I learned from this so maybe you didn't. So I'm here to give you this peep talk. Man up take care of your family you are not always going to be happy and it sounds like your wife isn't happy with the 40gees.
As far as her leaving you if you don't take the job she should learn to be a woman who knows what for better or worse means. She might not so it's time for you to find them balls and take care of business and save the day. Control the situation and make the best of it.
I like the way you didn't sugar coat your advise!
How long have you been a steward?