It sounds like the abuse is escalating OP and you're in the 'tension building phase ' of the abuse cycle. He's looking for excuses to kick off.
The walking in front of you and talking over you is typical of abusers, I know it feels as though this is just happening to you but it isn't. Many survivors have experienced similar behaviour. It's a way of asserting dominance and control over you and intimidating you.
Have you worked out where you'll go if you need to flee? Can you email the helpline for advice?
I know you don't think you'll need to and I'm exaggerating but it's better to be prepared.
He doesn't like to be challenged, no abusers do and he'll find a way of punishing you for infractions. He's also bullying the children. The atmosphere at home must be very tense.
If you manage to get him out of the house for a while, what you did before was perfect, by saying you'd stay in with the children, you can perhaps try to pack some small bags and hide them.
Safe spaces in the house are anywhere with a door or window so you aren't trapped. Avoid the kitchen, the garage or shed and bathroom. It feels like a natural place to flee, the bathroom but it's full of very hard surfaces (sinks and baths) and you're effectively trapped in there if he gets in.
The aim is to get out and away from him. If you can, get in the car and drive to the nearest police station.
I know that WA workers are working from home and they are still supporting people. Can you email the WA worker you were in contact with OP and ask for a safe space to flee? Also ask if injunctions are still being processed in NI.
Please humour me here and do the above if you can.