I'm so sorry he's put you through this - knowing you suffer from anxiety largely fuelled by just this sort of behaviour from an ex.
Stupid, thoughtless, careless and selfish behaviour from the start.
And a criminal decision that could have cost lives.
The police should have had a record of his arrest and detention and you should have been informed, unless he refused a phone call which would at least have told you what had happened.
You must be doubly exhausted from no sleep and the distress.
I hope you're with your Mum, able to rest and hopefully have a nice family day out.
You'll decide what to do, but I'd suggest…
Don't do what he did. No silent treatment or ghosting him.
Send a text soon setting out exactly how you feel - disrespected, exhausted, offended, hurt, angry - because of the way he chose to behave, how it made you feel and how he could have killed someone last night.
Calm, clear, civilised language - however in turmoil you must feel, triggering his defensive fight or flight reaction won't help.
Tell him you'll be having an adult conversation when he's slept off the hangover and when you return.
And set the example by being home when you say you will.
Difficult though it will be, the face to face conversation will also need to be calm and civilised for the same reason.
Set those boundaries - in future, here's how I expect you to treat me.
You're worth more than this.