oh congrats to your hubby!! but what bad timing. is there anyone that could come and stay with you to help out. siblings/friend maybe?
If he moves to Canberra, will you eventually go and live there with him for the duration of his employment?? or is that not likely because of kids and school etc.

it might be a case of short term pain,long term gain, if the money is good. but your health is MUCH more important so if u just arent able to make it work so that you stay happy and healthy, maybe he could wait for something closer to come up.

good luck!!!