OP I hope you can settle back in Aus , go easy on yourself . I lived all over the world and have never felt completely settled back in UK, there is no one country that has everything for everyone, although I found Sweden to be the nearest to my personal nirvana, and will always miss the progressive society of intelligent, non dumbed down ,kind and non judgemental people, so much higher quality public services, including their version of the NHS..the UK seems to be going in the opposite direction more and more, to me. And Swedish summers are perfect ! Clear, fresh,warmer and drier than here, which surprises a lot. Winters are magical, nothing stops for snow, obviously, and months of blue skies, sunshine, dry cold which even at -15, doesn't feel as cold as windy, wet, grey England. My question is, if you or your OH developed serious, long term health conditions, where would you rather be? I was unfortunate enough to be thrown in this position, so my rather first world quandary of where to emigrate /re emigrate to permanently became irrelevant as I permanently lost my physical and financial means to do so, and to live a full live as I previously knew, anywhere, became just a memory.
Today is really all anybody has, and to live for today, to be fully and joyfully in the moment, to be present in our lives as they are right now, to fully see and appreciate the privileges we really have , is the greatest freedom and comfort, that transcends and can answer a lot of life choices. Respectfully, "first world" humans don't seem capable of being fully present , to simplify our lives, until all other privileges and choices are taken away. I know I wasn't. So I try to use my personal tragedies as a positive , so others don't have to suffer so greatly just to learn how to be fully, joyfully present and at peace with ourselves, right now, wherever that is. Very best wishes .