Hi op,
Running errands, thats what life is, life has not changed, the things you have to do and the things you want to do, do not change.
The only difference is he is not there being however he was..... he could have been, obnoxious, angry, moody, sulky, selfish, arrogant etc etc.
Fill in the gaps ..... if you think of him, think of the shit because the mind tends to forget that stuff. Get on with your stuff, it's what we all do, it's nothing special and it very rarely feels better when there is an arsehole of a husband beside you pulling you down.
You are cracking on, you are strong and there will be better times ahead, I promise.
Unfortunately I don't think the same can be said of that rediculous couple, the bubble will burst, give us a shout when that happens cause I know there will be a resounding round of applause when that man and woman hit rock bottom.
Hopefully the weather will soon improve and we can all get to our garden centres, go for coffees, visit families and generally be little bit more occupied.
Hope tonight's sleep is a good one. 
Your a star 