When I read your post OP, it was so eerily similar to me that I felt I needed to respond. My husband was offered a promotion in Australia having got a bit stuck in his previous role. I was very reluctant to move as I felt the kids were settled and I didn’t want to leave my friends and family. In the end I decided we had to do it, as DH has always been keen to move abroad and I knew he would need to get it out of his system. Our situation was slightly different as DS2 has additional needs and I had put a lot of work into getting him settled into an inclusive school etc in the U.K.
After researching what would be available for DS2 in Australia, we moved at the end of last year. I can honestly say the move was the hardest thing I’ve ever done in my life! We had as much professional and financial help from DH’s company as you could possibly get and I still found it really tough! You have to up end every part of your life. The wrench of saying goodbye to my family and seeing DS1 saying goodbye to his friends was awful.
However, now we are here I'm so glad we did it. The older two DC have settled well at school and we have a really good life. We have already had some amazing experiences on trips we have been on and considering our DC had never flown long haul before, they are all seasoned travellers now, even my 2 year old. I feel like we all have gained so much life experience and when I think of my life in the U.K. doing the same school run for years on end, working in the same job, it feels claustrophobic.
DH continues to be stressed and work long hours, I imagine that would be the same for your DH. We don’t seem to be better off financially as we are in an expensive city and our house in London has needed quite a lot of work while it has been rented out. All that aside, I still wouldn’t change the decision to come here and if we get the chance, I think we would all like to stay longer than the 3 years we came for.
Our marriage is really strong and DH and I have been though a lot together in the past, but I feel like we are happier than ever and the family is so close having had this experience. You do need to bear in mind the international law implications if you are concerned that it might not work out while you are abroad.
Talk to your DH. Find out what help you could get with the move. Your kids are at a good age to move and they would get a lot out of the experience, but you have to decide if you would be happy with the decision as it won’t be easy for you.