Burning the cals on the floor

Who would have ever thought that I would get such a good workout working as a nurse.  For 12 hours straight I am on my feet racing from room to room with only 30 minutes for lunch.  This morning I weighed in at 248, the problem is on the off days I am to tired and find my body wanting to eat to make up for the days I don't get to.  Now I need to find a balance between the two.  Hopefully I can keep burning the calories and not let my body adjust to walking so far every work day.