You poor woman.
Of course you need some support.
You were pressurised into having a baby by a waster.
He sounds useless.
Unfortunately you need to help yourself as he isn't going to.
Reach out for support from your GP.
There is no shame in realising that you need help.
Perhaps this isn't for you.
It isn't for everyone.
But with support you can come to a real decision.
Would you like to return to Australia with your baby?
If so, talk to your family.
Bringing the baby to work is really not sustainable and your useless husband telling you that you have to run a business with a baby and without childcare, is controlling and abusive.
Your baby needs proper childcare.
Of course you are stressed out of your mind doing both, and that waster not even taking the baby when he finishes work.
Of course you are stressed.
Stop thinking as a couple and start thinking about yourself and your baby and what is best for you both.
It is ok to not want this.
But talk to your GP and get support so that whatever decisions you make are borne from what you really want and not desperation.
I feel so sorry for you.