I don't know re work but I'm going to throw so general tips at you for survival, your husband may help but he won't be by your side 24/7
These are the best links i know of for this, take whatever applies, its not medical advice but general help
www.mybrokenleg.com/tips.html
www.lifebeyond4limbs.com/coping-with-life-and-a-leg-injury/
You said cant shower if you can get a garden chair into your shower, you can sit down and shower, lay a hand towel on the seat if makes you feel more comfortable (patterns in chairs on your bum afterwards is not a good feeling)
www.boots.com/bloccs-waterproof-protector-for-casts-and-dressings-adult-full-leg-10199060 - This will allow you to shower safely without affecting the cast, dont lock the bathroom door and maybe for 1st few times esp as prob on painkillers have someone around in case you get dizzy etc
Even if can make it to class, your head may be fuzzy at times however you also have a load of students who you can assign to help with various things - its part of a learning experience for them, even if you hand them a copy of stuff to write up on a whiteboard or whatever, they can carry stuff, get things from you from other rooms, it wont do any harm - dependant on age of course, if 4/5 year olds maybe not so practical
Work out clothes you can wear with a cast potentially, capris trousers, dresses, a couple of cheap pairs of black yoga type bottoms where you can cut the side you need to and slit up the seam on that side
Have a rucksack handy for your personal effects and keep it on your back when on crutches
if operated on you may be able to get a wheelchair from local Shopmobility as my local NHS doesn't issue them for what they consider short-term problems (it was 3 years before they recognised i needed one and that was down to consultants) and get a leg rest so it can stay elevated in front of you
I know posters on another thread had a bit of a lol about my suggesting laxatives for someone who was going to have a hysterectomy, however, I would also recommend some here too as if you are taking painkillers you don't want to deal with painkiller induced constipation as well - trust me on that
Best of luck