Stop asking these questions "should they come back to normal or could the damage be irreversible?"

Unless you have access to a time machine to go back in time, don't worry about what has happened. Look at every set back as recoverable. The only way to know otherwise it to see what happens over time.

You have too much life ahead to spend it looking backwards.

Adrenaline from an outburst can mess up your brain's chemistry for a while.