I can't upvote this simple advice enough. You need to unplug and find productive ways (read: not involving drinking, eating crap) to de-stress. The gym works for me, as does going for a long walk. Good luck.
Order in lots of easy to cook but healthy food so you dont have to go to the shops when a deadline is looming.
Cook a few meals at a time- a couple of tins of tomatoes, onions and garlic cooked in a big pot then stored in tupperware will give you a sauce you can quickly throw over tuna, chicken, veg etc.
Have an emergency stash of money.