Hope you're feeling a bit less shocked this morning @Smellbellina.
I totally get how paralysing the trauma of suffering a violent attack is, especially a life-threatening one. I recommend reading papers by a woman called Zoe Lodrick, or watching her YT videos. She explains why and how being terrorised robs victims of agency to take action.
A strategy we were taught to use is to ask the victim to imagine what she would be saying and what advice she would be giving to a friend or family member who was suffering the same sort of abuse as she was. This depersonalises it, and puts it at one remove, so that it becomes easier to see clearly what needs to be done. That can help the abused woman to take the necessary action.
The safety of you and your DC is paramount. If you were a client of mine, and I was aware of what had happened to you, I would have to raise a safeguarding with children's social services because physical abuse to a parent is also emotional abuse to a child.
All the practicalities can be taken care of. People on here have given you great advice. Given the level and nature of the violence, you may well be able to apply for an emergency non-molestation order. This can be done online, details here www.gov.uk/injunction-domestic-violence .
Where I live, the police are very pro-active regarding DV and hopefully your local force is the same. They may be prepared to put a "marker" on your address so that any call from there is given high priority. They are also very sympathetic and understanding, and realise that what has happened is a serious crime. It's also not too late to report what happened yesterday, even though there's no immediate danger.
If you have been left with any marks on your neck from yesterday's attack, take some photos of them on your phone and send them to someone you trust, eg your sister. They could prove useful evidence later on.
Pretend to yourself that you are helping someone else to put a stop to being abused. This may help you to take the actions you need to to stay safe and keep your DC safe.
You'll get great advice and support on here and hopefully from your DSis and BIL too. But please, do something to keep yourself and your family safe from this vile man. Before it's too late.
Don't become one of the 2 women a week who are killed by their partners.