Give yourself a break. I would think the suggestion in one of the earlier posts of writing an easy food list is a good idea.
A menu also means you don’t have to think about what to cook when you walk through the door - just follow the menu/ list!
Even if you write one list and repeat it for now… just check what you need to reorder for the next week.
Only other things I can think of are;
Book a food shop collection on your way home from work, one you can collect in Carpark easier than getting kids in and out of car etc!
For now aim for ready meals, maybe not the healthiest line up, but cheaper than takeaway and maybe carrot sticks, fruit, etc to go with them?
In a couple of weeks time aim to cook one larger (batch meal) on a Sunday (assuming you work Mon- Fri). Start with something simple your children are likely to eat!
When my kids were young I often made a slow cooker dinner on a Sunday. In the morning (I used to let them ‘help’ with the prep)… littlest ones in high chairs etc… making it play might make it easier and take stress out of cooking. We used to go out in the day and come back to lovely dinner!
It will get easier I am sure.
Well done on taking first steps