You have had a tough start, you have no network, of course you are going to want to gravitate to family and familiar things.
It costs nothing to investigate, to research and see if it's viable to get a job back there etc etc.
Do your homework, see what you come up with and then you make decisions and DH can see his options over there too.
TBH, if you hand't had PND, you wouldn't be feeling like this, try not to blame your life for PND, blame PND for your unhappiness now. It will pass, this fug will not last forever, and you will go back to happy.
PND can strike anyone of us, I had full blown depression 5+ years before having DS, and naturally was worried that I could get it again. Luckily I didn't.
Do your research, that alone will get your brain busy and focussed on something pleasant, that will help your day to day, to have a goal, an ambition.
DS is 1yo, you have oodles and oodles of time to find the perfect job, house and school. Don't worry, you will get to where you need to be.