I am so sorry to hear that you and your hubby are having problems, but turning to food isn't going to make those problems go away. I know this isn't easy, but at a time like this, you really do have to take care of your body. It's not just about the possibility of gaining weight because you're overeating. Your body is under a lot of stress because of the arguments, the worry, the anxiety, etc... Stress reeks havoc on our bodies. Thus the reason we have to do our best to take care of ourselves at times like these.
You may find heading to the gym helps you reduce some of that stress. I find I feel better after a good workout. Your gym is your time to yourself. So, do try to stick with the exercise. it can help you feel a bit better in times like these.
Mostly, you do the best you can. Take things day to day. You can't do everything. You make your list of priorities and go down the list.