Hi UM, I've seriously got to admire your courage or resilience (either!!) in stretching out the day!!
But give yourself a break, you started of OK, you went for dinner with your wife those things in themselves are brilliant!!!!
The rest, well would you really, really be too disappointed if you didn't go shopping as well the next time around??
Give yourself some real credit for what you managed before the shopping, and it must have really meant something to your wife too!!.
And hey, lesson learnt maybe?? Can't be superman all the time !! In fact superman would probably have fallen apart too at that point if he'd been going through the same feelings as you!!
And go easy on yourself, right??!! One step at a time. What would be weird about that day would be if you had an allergic reaction to the store but you didn't much more like overload and that you can come back from/that you will come back from if you maybe just try pacing yourself and not too much at once.
Hang on in there, you've already shown yourself what you're capable of (in a good way- with the OK start and meal out), that's still there, don't forget it!!
Alison

And P.S. no "beating yourself up"/feeling worse because you can't do x,y or z right now (I know you probably are!! ) doesn't matter. There's a lot you are doing which you probably aren't giving yourself credit for!! Including helping so many people on here!!!!