From the sounds of it your mind is telling you that your body needs attention. I don't know how old you are but that is probably a factor. I would strongly recommend strength exercise. Walking or minor aroebic exercise will not help much. If you work on building your strength this will assist your metabolism. I'm not sure what exercise will work best for you, but I would stick with core muscles overall.

I think if you become more in tune with fixing/coping with your body issues you will have a better outlook on your life and relationship with your hubby might get better...