Uterus, I was shaking in anger at that excuse for a man when I read your post.
You are, in shock, terrible grief and shock but as others have said, your body is reacting physically. It's scary, but you will be ok and you are showing signs already of the fog starting to lift.
I applaud you, you're so much stronger than you give yourself credit for.
Baby steps is right, keep it practical, what needs to be done, what can wait.
Call in sick, get signed off for a while. Take whatever you need to sleep. Try and eat. Mind those kids. Get RL support but stay here too.
In time, you need to take his control over you back. Find out what really happened and why he detached so long ago. But right now, mind yourself. Breathe, walk, try to sleep. It does and will get easier and you are well rid of any man who thinks text is any way to communicate that kind of message.
The other ladies here who have been through it have so much unfortunate wisdom. Believe it, even if you don't want to. They are your guides.
Hold it together girl, we're all here. X