I'd be interested in knowing a bit about what your psychologists have said. I am a counselor, not a psychologist, with many expat clients -- here is my perspective:

You are grieving. You didn't leave Australia with a full head of steam excited about coming to France, looking forward to the future. You didn't say to yourself, "I'm sad to lose what I have in Australia, but the prospect of moving to France will ultimately more than make up for it." You compromised, reluctantly, to give up Australia. And what did this mean giving up? Everything except your family! Your routines, your friends, your comforts, your systems, your familiarity, your culture, your food, your language. Everything. And even though you are still with your family, when a whole family moves to a new place, even dynamics within the family can subtly change from the external forces of the new place.

Life is challenging enough as it is when you are living in your country of birth, and much of the first 40 years of your life or so is spent figuring out how to make school, work, and family function in the place you are. And it's an achievement to make it happen. And now it's all gone! And I don't say this to be dramatic -- it's to underscore what an absolutely massive change and challenge it is to move, *even if you are ecstatically excited about where you're moving to.*

Concerning the original decision about your moving and his not having kids -- I'm not commenting on that, other than to say it is entirely possible that both of you are still feeling some resentment about this, even if, on balance, the compromise felt worth it. The reason I mention this is because those feelings can soften and be more easily swept under the rug over time when you can establish routines, a regular life, etc. But the move, even after years, can bring to the fore issues that have long been in the background (as evidenced by some of the emotional distance you are feeling with your husband).

Now, to the present issue. As I said before, even people who are thrilled about a move can take quite some time to "adapt" to the culture. But you can't stand it there -- the rigidity of social hierarchy and authority in medical institutions (you find the same in how teachers relate to students), the overabundance of bureaucracy, the undervaluing of efficacy and meritocracy. And what do you feel like *you* are getting for your troubles? Nothing apart from enabling your husband to continue with his career.

And is that worth it to you? You say yourself, "Now I want to go back to Australia and live as a single mother with my son." This is clear as day. I believe you that you love your husband and that you don't want your son to grow up without both parents. And yet these factors seem not to have muddied your ability to say simply what you want -- to go back to Australia.

Now, I'm going to return again to your initial decision to move, again, not to pass judgment on whether it was the right thing or not. But ideally (and this really is idealistic, but not impossible), even when a couple makes a decision that is a huge sacrifice for one person, there is enough conversation, enough being there for one another, enough understanding both each other's point of view but also one's position, that when the decision is made, there is perhaps deep sadness about what is lost, but the decision isn't made *reluctantly* (both about where to live and to have kids). The reason I mention this is that while your emotional distance from your husband is currently quite acute, I have a feeling it has been this way for quite some time. So this means there is the possibility that communication between the two of you has not been great, and there is perhaps the possibility of a 3rd option that could work for everyone (I don't know what exactly that would be, but one of the consequences (and/or causes) of emotional distancing is a kind of rigidity and narrowing of considering various options precisely because so much energy is being used to protect one's own feelings.

So, in the end, of course the decision is up to you. But the main feeling I'm getting here is some conflicting feelings about your feelings about France -- that is, there are many aspects of it you can't stand, but at the same time you somewhat question your right to be aggravated about them because you feel you should somehow have already adapted.

There is a lot of tension, ambivalence, and disconnection both from yourself and your husband going on here. I think what you need most of all isn't time to reflect, but perhaps some way of getting some wider perspective on your overall situation.

Also, just as an aside, I realize I am making a LOT of assumptions here. I don't know you, I don't know your husband, I don't know your situations. So a lot of this is a shot in the dark. But it's precisely because I find that when my clients need most is a strong third perspective on whatever it is they're going through so that they can gain more clarity on their own position, that's what I'm offering here.

In case this is helpful, I've written a bit about some issues both directly and tangentially related to your situation:

https://therapy-in-english.com/blog/my-relationship-is-falling-apart-after-moving-abroad
https://therapy-in-english.com/blog/i-moved-abroad-for-my-partner
https://therapy-in-english.com/blog/i-resent-my-partner-for-bringing-me-here