I’m so sorry he did this to you. It’s the worst kind of betrayal from someone who’s supposed to love you and it is a very strong indicator that he could kill you in future - putting his hands around your neck is one of the most dangerous things a man can do. I’m glad you have your sister with you.
Please get police involved if you have the strength. If you don’t feel you can do that, please take lots of photos, potentially with your sister witnessing that she took them and that the bruises etc are real, and write down exactly what happened so that when you do feel up to it, you have the evidence. Even if you don’t feel like it today, hopefully soon you will realise it’s the only way to protect yourself and your dc from him.
This happened to me once, I was very young and didn’t report it but it has stayed with me. To see my attacker smiling with his wife on Facebook is galling to say the least. He should be prosecuted for assault or potentially attempted murder given how serious the attack was that it’s left you covered in bruises.
Please don’t waste a single moment worrying about what will happen to him after he did something so brutal. Don’t feel you have to cover for him with friends and family either. He will deserve whatever comes his way and more.
Your DC need protecting from this abusive piece of shit and police involvement is the best way to make sure this happens, but at the moment, just rely on your family to take good care of you, you must be in shock today. 