I've had flu a couple of times the last two years or so. I was physically unable to get out of bed and cried a lot as I felt so bloody miserable. And I have very strong painkillers for other conditions but nothing helped!
I couldn't take my dc to school and Gawd knows what they did/ate on the days where I was here myself. (My mum and dad did help out and dh was here on his days off)
I go in every day with long-term chronic pain and last year, I went in for months with a sinus infection until the doctor told me that I would actually have to stay off and rest. Whilst trying my 4th round of antibiotics. A year on, more or less, and I'm being referred to ENT for chronic sinus pain.
Maybe if I'd allowed myself to rest and recover properly in the first place, I might not be in this position now.
Oh and if I'm off in the next few months, I will be escalated to the next level of attendance review.
Way to go. So when I'm throwing my guts up again whilst simultaneously emitting from the other end (accounting for another absence), I'll have to go in so as to avoid procedures against me.
As a primary teacher, I don't stay off unless I'm physically incapable of going in. Tbh, every single day is a struggle as I now have 3 long-term pain conditions. It takes me a shed-load of painkillers at 6.30am to enable me to do so.
Plus an assortment of gadgets/gizmos when I get home to try and alleviate the pain. Oh and wine helps when I'm desperate 
Sorry, don't mean to sound all "oh poor me"!