The joys of working in a place and getting time off, i miss that about ireland. I used to work a week in the Mater hospital in dublin and then one week off which was great. You dont get that in England!! Anyways gone totally off topic but it brought back memories.
Keep yourself busy as possible over those four days, if you have to, go for walks, clean the house, anything really to stop you thinking about food. As time goes by it does get better and you do stop dreaming off it.