Hi again, subwife.
Saying this gently:
Your husband is an addict.
He rages at you.
He is pressuring to have another child, but he isn’t careful about keeping substances away from places your child will be.
You have a job, and you do most of the at home stuff.
Because your husband is an addict.
Couple of things: ultimatums don’t work unless you mean them.
If you tell him you want him to get treatment and he pushes back, what then?
The other thing: children in addict families see a lot more than we think they do, and understand a lot more than we think they do.
You and your child sound like you are in a risky situation now.
Bringing another child into it just isn’t a good idea.
My opinion only.
Good luck.