Ana, this is not about job v family, its about job v you, you sound to me as if you are really getting stressed about this, and are bringing it home with you (maybe Im wrong). You have a loving husband who has told you to resign, what more advice do you need ?.

You need to change your job, even if you move to another store (same company) its highly likely they will have the same rules, what you really need to decide is do you find another job first, or leave and then find a job, its much easier in some ways to find a job when you are out of work, as finding a job is a job in itself, and can be time consuming. Most big companies dont have time for the individual, and smaller companies are usually much more approachable, and understanding of a persons needs.
Good luck, and i hope you sort things out sooner rather than later.