I can understand your situation and the frustration you feel. My workload is sometimes overwhelming to me, and I do have trouble at times with striking a healthy balance. I know that I feel better overall and have more energy to do my job well when I’m fit, but during the last school year, between the work stress and injury, I did drop the ball fitness-wise.
So I am determined to make some needed changes. In my case, I am shooting for 5 days of working out per week, allowing myself two rest days during the busy workweek. When possible, I plan to work out *before* work so there’s less likelihood of my plan getting derailed or me being too exhausted at the end of the day. If I have a run scheduled for the afternoon, then it’s happening immediately after work—no getting comfortable or checking email or Facebook first. I probably kill too much time on the computer, anyway. I’m also laying out my workout clothes the night before. Do you have set days off that you know for sure you can do workouts on those days? Can you work it out with your DH that you start an hour later a few times a week, and vice versa so he gets a little time for himself, too? Do you (or can you) take a lunch break, where you fit in a short walk walk daily? Even if you can only spare 15-20 minutes, at least you're moving.
Where the snacking is concerned, I know it’s hard when something’s right there in front of you, but maybe try this: Before you reach for a candy bar, drink a full glass of water and have a yogurt or a piece of fruit and wait 15 minutes. Chances are, you won’t still be hungry. Another thing you could do is: every time you want a bag of chips but resist it, reward yourself with $1. Every time you work out or lose a lb., do the same. Put it in a jar and when you reach your goal, treat yourself to a non-food reward like a new outfit or a massage or pedicure.
Hope some of these ideas might help. Best of luck to you! I know how hard it can be, but we can do it! We *have* to do it!