I'm not sure why or when we seemed to make a collective decision that anyone who carries on working/going to school when they're unwell is somehow morally superior.
Why on earth do people compete for bragging rights about how little time they've had off? Or how they "managed to power through" <insert your choice of debilitating illnesses/surgery etc>.
There's no medal for pushing yourself through misery when you'd be much better taking a day off sick and recovering.
The UK - and certain other countries - has a terrible attitude to self-care, and completely lacks balance in its approach to well-being and health.
Having children fixed my heavy periods, but I had a nightmare when I was younger. Occasionally my DD has a horrible period that leaves her doubled over in pain - but the majority are absolutely fine and she doesn't even need pain relief. If she was having one of her bad periods, then there's not a single chance in this world that I'd force her to power through it and endure a day of misery just to fulfil a headteacher's desired attendance quota. And I was a school governor for over five years, so it's not as if I don't appreciate the importance of good attendance....
I know there's a back story but really, this is happening in multiple schools and I don't care what the excuse is - it's not OK. We should be teaching our children to prioritise their wellbeing and to take time out if they are genuinely unwell. There's no shame in giving your body time to heal and recover.