I don't remember anyone vomiting when I was at school. Maybe it happened, but it wasn't memorable if it did, and it certainly wasn't a regular occurrence.
We were brought up much as others on this thread. If we had a verifiable disease such as chicken pox, we were bought Locozade and maybe a comic to read, and generally nursed back to health. In those days there was also a convalescent period of a few days before children were sent back to school.
If we just declared that we 'didn't feel well', we were sent to school to 'see how you get on'. If we did persuade mum that we were ill enough to have a day off, it was strictly bed, no reading, no getting up, and definitely no TV. We got 'convalescent food', such as scrambled egg or soup.
When we grew up, we all had the same attitude to illness. It is an inconvenience, but not one you inflict on others. I shared an office for years with someone who had been coddled as a child when she was 'ill'. A slight sniffle meant she was allowed to lie on the sofa watching Crown Court, fed grapes and Cocopops (a treat in those days), and generally pampered.
As an adult she would take a day off as soon as she didn't want to do something, would opt out of things she didn't enjoy by going on the sick, and regularly had 6 months off for stress. The rest of us had to cover for her, but she couldn't understand why we weren't queuing up with cards and flowers to wish her well.
Incidentally, my mum wasn't 'a slave to wages' - she was a stay-at-home mum who valued education. I also suspect that the fact that she was brought up before the NHS will have influenced her attitude to illness and how to deal with it.