Honestly Cash, I've been put in a similar situation. We moved interstate (actually 3.5 hour flight away from my family/friends & original pdoc) to a regional town to be with my partners dad. I went downhill pretty significantly, felt very isolated, didn't have anyone to lean on but my partner, who sounds somewhat similar to yours in that he either doesn't understand or is unwilling to accept my own struggle with my mental health, he just plain doesn't believe it really exists, & is completely in the dark as to how to support me (I think it's too much stress for him).

Since I've returned home I have much more support. I know you get a lot of support from your mum, which is where I find my rock. She's willing to do anything. It could turn out to be perfectly fine Cash, but consider your own needs before doing this.

I like MiguelsMums suggestion, a nurse can come to give your your mess & check on your welfare? 40 min isn't terribly far but if you can't drive your stuck relying on your husband. I understand you guys have made progress though, such a tricky situation.