Just go along to WI hun, and whatever happens happens. Draw a line under it and start fresh. :break_diet: Its just a wee mistake, dont let it grow into a big one.
When you're feeling down about going to WI, it's always a good idea to go along, it'll help give you a quick kick up the bum and the boost you need to get back on track.
People at my group say time and time again that the best thing to do after a bad day/week/month is to along to group.