I get people turning up to my clinics high on drugs, if there's no security around I call the police. I've had patients go to the toilet to do a urine sample and have taken a drug overdose and collapsed. I've had someone take a heart attack in front of me and have had to use a defibrillator
We've had drug fuelled intruders, a teen showing symptoms of a heart attack and on one occasion a parent's waters broke in Reception...
...just a day in the life of a school administrator! I have absolutely no clue how my teaching colleagues do it.
It's not just teaching lessons, it's the planning, the marking, the extra curricular stuff, the pastoral care, the dealing with parents. In the case of some kids it's dealing with multiple external agencies to ensure their mental & physical health, additional needs and safeguarding issues are taken care of.
And then it's having to record everything in minute detail because the powers that be require data and analysis about every single thing that goes on in a school. The risk assessments, consent forms, absence requests that need processing, the expectation that on top of everything else you'll be involved in fundraisers at the drop of a hat.
And yes, in theory you might get 13 weeks holiday a year, but in reality a substantial amount of that time will still be working to varying degrees, and when you're not you have to fit in all the millions of things you can't do during in term time because you're too busy/exhausted. Nearly all the support staff I know, like me, are contracted to work part of the holidays, so no I'm not especially looking forward to 'the end of term and six weeks off' because my end of term won't be happening in 3 weeks and I won't be having 6 weeks off!
And during term time (if you're full time) you've no flexibility at all so if your child is unwell, or your elderly parent breaks a hip, or you find yourself in another emergency situation you have the added hoop-jumping, paperwork and guilt complex that taking time off entails.
Hope that clarifies some of the issues that make teaching/working in a school stressful!