Go straight home, shower and change is a good first step. This morning I stopped off at the market to buy dog food and bread, and then came home and read more SM Sterling. Running an errand is okay *after* I've got the habit set, but I need to set the habit, first. Go home, shower, and change. Then Do Something Useful. Have the Usefulness planned out, too.
I should also figure out when I'm eating, and what meal it is. Am I doing a meal-and-three-snacks plan? Two meals? Three? I don't think I need three, at this point. MS3 sounds like a good approach; a 4am nibble, a 9am nibble, a noonish nibble, and Dinner With Family. Plus you, if you're in the neighborhood.
Zack made salmon and bokchoy udon last night; rather messy prep but excellent food. Like most soups, we ended up with far more than we could eat, so we now have frozen soup available. Right now I'll grab some quick pasta, and that shower-and-change.