Forgetting to eat is something I remember, one time I realised that all I’d had to eat for 4 days was toast and bananas and I only realised that because I’d run out of toast and bananas. Eating became a chore for quite while but you’ve got to keep on top of it in order to be able to do everything else you need to.
Dealing with official channels such as banks can be an almighty pain in the arse, I can’t really offer any advice there beyond keep trying to speak to the most senior person you can and explain the situation early on, eventually you’ll find the right person that can bend the rules enough to be practical.
When there’s a proper crisis and this qualifies as that, lots of people will edge a little closer into your life, let them help, your main focus needs to be on your wife so if a neighbour or a friend offers to take the kid to school or do some shopping accept the offer. The other thing that could come as a surprise is that there might be one or two people that pull further away. Don’t be too harsh in your thoughts towards them, they may feel that they would only be getting in the way and that you need space or it may be that they genuinely don’t know how to approach the issue so choose not to engage.