You should make a plan unknown to him and just go. Find somewhere safe to stay for you and your child and notify the police so they’re aware. Ring the Domestic Violence helpline maybe.
You can tell him why etc once you’ve gone via text or email. If he’s in another country right now that should make things easier.
Cocaine is a horrible drug and causes extreme paranoia which can sometimes result in violence.
Be strong and safe, get away from him.