I've been there, although was only non-weight bearing for 5 weeks. I'm so sorry this is happening to you. It is hell on earth - sorry.
I broke my ankle in January and had a 10mo and nearly 3 yo. I just had to rely on people coming in to look after the children because I wasn't safe on my own. Hopefully with a 22mo and 4yo, they are a bit more self sufficient.
The things I found hardest were making meals as I couldn't carry things - especially hot things. After the initial couple of weeks of pain, I could get down onto the floor to play with the DC's, so as long as someone put nappy changing stuff on the floor I could do that. I also had a good line in bum shuffling, so could get around a bit.
Getting out of the house was hard, but Tesco have wheelchairs that you can use. You just ask at customer service. The chairs are easy to use and meant I could do something normal.
Um, what else? Listen to the docs. If they say don't bear weight then don't. The most important thing is that you are back up and running (well, walking) asap. I found that after 5 weeks of not putting any weight on it at all, I could walk using the cast as support. Then when the cast came off I didn't need the crutches at all.
Make sure you have a pillow under your cast in bed. Finding a comfy position to sleep in is very hard but if my leg was elevated it was easier.
And I hope that the GP's are useful, helpful types 'cos you are going to need them. Bite your tongue and remember that you can undo any issues once you are mobile again. Please don't ask me about the state of our playroom. I had just sorted out all the boxes. It was so beautiful. Grrrr.
I'll post more if I can think of anything. I hope you aren't in too much pain.