My own dd is in year 5 and is constantly grumpy 🙄. She cried over maths today, not because it was too hard (it really wasn't!), But because I was sitting with her but didn't immediately and psychically know she was stuck on a question she hadn't tried yet. I snapped at her in a way I would never snap at the kids at school 
poor kid.
She's become an amazing interior designer/architect as she's spending so much time playing Roblox and building houses on there. That's the positive I'm taking from her "unschooling" experience.
The head emailed us all an article (I don't know where he found it or I'd share it with you), that basically said, primary kids are adaptable, don't stress about a temporary blip of a few months in the grand scheme of their education, practice some reading, writing and basic arithmetic for a couple of hours a day and let them be. So that's now my new philosophy for the rest of lockdown. If we do a bit of English and a bit of maths each day I'm happy.
The article also said that secondary kids are more adaptable than we give them credit for. Remote learning, whatever that looks like in your school, will be ok. You can't change the fact that some kids aren't engaging at all, or the fact that it's impossible to be at school, just keep providing some work for the kids to do while they're off and pick up the pieces when we get back. So I'm following that advice too.
And I've stopped coming on Mumsnet quite so often 😁 it's done wonders for my stress levels. Now in the evening I listen to a nice audiobook (from the library) and do a bit of crochet or a diamond painting. It's lovely.