It's tough dealing with a diet when you have so much work stress. It might be ok to just plan what to eat tomorrow only.
Somethings you like but are healthy.
Stuff that works for me are:
porridge or eggs for breakfast
Sandwich, Soup for lunch
Fish/Chicken with some veg for dinner
Drink plenty of water
Eat a couple of pieces of fruit
Desert - have a couple of scoop of ice cream!
Remember that lack of sleep just makes stress worse so watch that.
Doing some exercise can be a better way to cope with stress rather than eating fatty food.
All in all, be good to your self.
Hope this helps a little bit,