going back to GP coming on here to talk trying to distract yourself with shopping
DH being unhelpful - don't blame yourself, he chose to sod off for the day.
How urgent is the shopping? Is it a huge disaster if you just order milk bread cereal fruit etc - ie just staples and bother about the rest another day? Then at least you can flop on the sofa and put the children in front of the tv.
Poor you - you do sound upset. How old are the dcs?